Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?

Question

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Answer 1

Textbook Question

Chapter 10, Problem 1ILQ

Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?

Expert Solution

Summary Introduction

(a) To write:

The names of junction points between sarcomeres.

Introduction:

Sarcomeres are the units of the skeletal muscle which are formed of muscle fibers. Many sarcomeres together form myofibrils.

Explanation of Solution

Sarcomeres are the units of muscles and junction points between sarcomeres is Z line. In between two Z lines, two sarcomere units are present. At Z line, actin filaments or the ends of sarcomere are present.

Conclusion

Junction points between sarcomeres is known as Z line.

Expert Solution

Summary Introduction

(b) To write:

The name of subunits of myofibrils.

Introduction:

Myofibrils are elongated thread like structures in the skeletal muscles. Many myofibrils together form skeletal muscles.

Explanation of Solution

The subunit of myofibrils are sarcomeres. Sarcomeres are the basic units of a skeletal muscle which together form myofibrils. These myofibrils together form a skeletal muscle.

Conclusion

Subunits of myofibrils are sarcomeres.

Expert Solution

Summary Introduction

(c) To write:

To determine what double strands of pearl means in the video.

Introduction:

In the given video double strands of pearl shows the arrangement of actin and myosin filament.

Explanation of Solution

In the given video, arrangement of actin filaments of skeletal muscle is shown. Actin filament is a thin filament which is formed by a double chain of many subunits. Both the chains are twisted and this resembles the structure of double strands of pearl.

Conclusion

Double strands of pearl resemble twisted double chain of actin filaments formed of many subunits.

Expert Solution

Summary Introduction

(d) To write:

To determine the reason of striated appearance of skeletal muscle.

Introduction:

Skeletal muscles have striated appearance due to presence of alternating dark and light bands in them.

Explanation of Solution

Due to arrangement of myosin and actin filaments, light and dark bands are formed. This gives striated appearance to the skeletal muscle. The A bands forms the dark bands as they have both actin and myosin filaments in them giving a dark appearance. The I bands forms light bands as they have only thin actin filaments in them. This results in striated appearance of a skeletal muscle.

Conclusion

Striated appearance of skeletal muscle is formed by dark A bands and light I bands formed by arrangement of actin and myosin filaments of the muscle.

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Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the “double strand of pearls” described in the video? (d) What gives a skeletal muscle fiber its striated appearance?

The release of calcium ions initiates muscle contractions.Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a)What are “T-tubules” and what is their role? (b) Pleasealso describe how actin-binding sites are made available forcross-bridging with myosin heads during contraction.

3) List and define the organizational structure of skeletal muscle beginning with the sacrcomere up ABC to a whole muscle. 4) Explain the differences between the zones and bands of a sarcomere. 5) List and explain the differences between contractile and non-contractile proteins. 6) What are the agonists, synergists, and antagonists to go from sitting to standing from a chair. 7) Provide an every day example of each of the 3 types of muscle actions. Name the muscle involved as well as the movement. 8) Why do we store energy as ATP and resynthesize it, instead of just storing all we need. 9) What are the differences between resting, steady state, and maximal metabolic rate? 10) Why would someone measure arm circumference? How would that be helpful? 11) MRI results in a grayscale of 0 (black) to 256 (white) for each pixel of tissue. How do we tell the difference between different types of tissue in the cross section of a limb (arm or leg, e.g. what's the difference between muscle and fat,…

Answer 2

Textbook Question

Chapter 10, Problem 1ILQ

Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?

Expert Solution

Summary Introduction

(a) To write:

The names of junction points between sarcomeres.

Introduction:

Sarcomeres are the units of the skeletal muscle which are formed of muscle fibers. Many sarcomeres together form myofibrils.

Explanation of Solution

Sarcomeres are the units of muscles and junction points between sarcomeres is Z line. In between two Z lines, two sarcomere units are present. At Z line, actin filaments or the ends of sarcomere are present.

Conclusion

Junction points between sarcomeres is known as Z line.

Expert Solution

Summary Introduction

(b) To write:

The name of subunits of myofibrils.

Introduction:

Myofibrils are elongated thread like structures in the skeletal muscles. Many myofibrils together form skeletal muscles.

Explanation of Solution

The subunit of myofibrils are sarcomeres. Sarcomeres are the basic units of a skeletal muscle which together form myofibrils. These myofibrils together form a skeletal muscle.

Conclusion

Subunits of myofibrils are sarcomeres.

Expert Solution

Summary Introduction

(c) To write:

To determine what double strands of pearl means in the video.

Introduction:

In the given video double strands of pearl shows the arrangement of actin and myosin filament.

Explanation of Solution

In the given video, arrangement of actin filaments of skeletal muscle is shown. Actin filament is a thin filament which is formed by a double chain of many subunits. Both the chains are twisted and this resembles the structure of double strands of pearl.

Conclusion

Double strands of pearl resemble twisted double chain of actin filaments formed of many subunits.

Expert Solution

Summary Introduction

(d) To write:

To determine the reason of striated appearance of skeletal muscle.

Introduction:

Skeletal muscles have striated appearance due to presence of alternating dark and light bands in them.

Explanation of Solution

Due to arrangement of myosin and actin filaments, light and dark bands are formed. This gives striated appearance to the skeletal muscle. The A bands forms the dark bands as they have both actin and myosin filaments in them giving a dark appearance. The I bands forms light bands as they have only thin actin filaments in them. This results in striated appearance of a skeletal muscle.

Conclusion

Striated appearance of skeletal muscle is formed by dark A bands and light I bands formed by arrangement of actin and myosin filaments of the muscle.

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Answer 3

Textbook Question

Chapter 10, Problem 1ILQ

Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?

Expert Solution

Summary Introduction

(a) To write:

The names of junction points between sarcomeres.

Introduction:

Sarcomeres are the units of the skeletal muscle which are formed of muscle fibers. Many sarcomeres together form myofibrils.

Explanation of Solution

Sarcomeres are the units of muscles and junction points between sarcomeres is Z line. In between two Z lines, two sarcomere units are present. At Z line, actin filaments or the ends of sarcomere are present.

Conclusion

Junction points between sarcomeres is known as Z line.

Expert Solution

Summary Introduction

(b) To write:

The name of subunits of myofibrils.

Introduction:

Myofibrils are elongated thread like structures in the skeletal muscles. Many myofibrils together form skeletal muscles.

Explanation of Solution

The subunit of myofibrils are sarcomeres. Sarcomeres are the basic units of a skeletal muscle which together form myofibrils. These myofibrils together form a skeletal muscle.

Conclusion

Subunits of myofibrils are sarcomeres.

Expert Solution

Summary Introduction

(c) To write:

To determine what double strands of pearl means in the video.

Introduction:

In the given video double strands of pearl shows the arrangement of actin and myosin filament.

Explanation of Solution

In the given video, arrangement of actin filaments of skeletal muscle is shown. Actin filament is a thin filament which is formed by a double chain of many subunits. Both the chains are twisted and this resembles the structure of double strands of pearl.

Conclusion

Double strands of pearl resemble twisted double chain of actin filaments formed of many subunits.

Expert Solution

Summary Introduction

(d) To write:

To determine the reason of striated appearance of skeletal muscle.

Introduction:

Skeletal muscles have striated appearance due to presence of alternating dark and light bands in them.

Explanation of Solution

Due to arrangement of myosin and actin filaments, light and dark bands are formed. This gives striated appearance to the skeletal muscle. The A bands forms the dark bands as they have both actin and myosin filaments in them giving a dark appearance. The I bands forms light bands as they have only thin actin filaments in them. This results in striated appearance of a skeletal muscle.

Conclusion

Striated appearance of skeletal muscle is formed by dark A bands and light I bands formed by arrangement of actin and myosin filaments of the muscle.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 10, Problem 1ILQ

Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?

Expert Solution

Summary Introduction

(a) To write:

The names of junction points between sarcomeres.

Introduction:

Sarcomeres are the units of the skeletal muscle which are formed of muscle fibers. Many sarcomeres together form myofibrils.

Explanation of Solution

Sarcomeres are the units of muscles and junction points between sarcomeres is Z line. In between two Z lines, two sarcomere units are present. At Z line, actin filaments or the ends of sarcomere are present.

Conclusion

Junction points between sarcomeres is known as Z line.

Expert Solution

Summary Introduction

(b) To write:

The name of subunits of myofibrils.

Introduction:

Myofibrils are elongated thread like structures in the skeletal muscles. Many myofibrils together form skeletal muscles.

Explanation of Solution

The subunit of myofibrils are sarcomeres. Sarcomeres are the basic units of a skeletal muscle which together form myofibrils. These myofibrils together form a skeletal muscle.

Conclusion

Subunits of myofibrils are sarcomeres.

Expert Solution

Summary Introduction

(c) To write:

To determine what double strands of pearl means in the video.

Introduction:

In the given video double strands of pearl shows the arrangement of actin and myosin filament.

Explanation of Solution

In the given video, arrangement of actin filaments of skeletal muscle is shown. Actin filament is a thin filament which is formed by a double chain of many subunits. Both the chains are twisted and this resembles the structure of double strands of pearl.

Conclusion

Double strands of pearl resemble twisted double chain of actin filaments formed of many subunits.

Expert Solution

Summary Introduction

(d) To write:

To determine the reason of striated appearance of skeletal muscle.

Introduction:

Skeletal muscles have striated appearance due to presence of alternating dark and light bands in them.

Explanation of Solution

Due to arrangement of myosin and actin filaments, light and dark bands are formed. This gives striated appearance to the skeletal muscle. The A bands forms the dark bands as they have both actin and myosin filaments in them giving a dark appearance. The I bands forms light bands as they have only thin actin filaments in them. This results in striated appearance of a skeletal muscle.

Conclusion

Striated appearance of skeletal muscle is formed by dark A bands and light I bands formed by arrangement of actin and myosin filaments of the muscle.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution

Summary Introduction

(a) To write:

The names of junction points between sarcomeres.

Introduction:

Sarcomeres are the units of the skeletal muscle which are formed of muscle fibers. Many sarcomeres together form myofibrils.

Explanation of Solution

Sarcomeres are the units of muscles and junction points between sarcomeres is Z line. In between two Z lines, two sarcomere units are present. At Z line, actin filaments or the ends of sarcomere are present.

Conclusion

Junction points between sarcomeres is known as Z line.

Expert Solution

Summary Introduction

(b) To write:

The name of subunits of myofibrils.

Introduction:

Myofibrils are elongated thread like structures in the skeletal muscles. Many myofibrils together form skeletal muscles.

Explanation of Solution

The subunit of myofibrils are sarcomeres. Sarcomeres are the basic units of a skeletal muscle which together form myofibrils. These myofibrils together form a skeletal muscle.

Conclusion

Subunits of myofibrils are sarcomeres.

Expert Solution

Summary Introduction

(c) To write:

To determine what double strands of pearl means in the video.

Introduction:

In the given video double strands of pearl shows the arrangement of actin and myosin filament.

Explanation of Solution

In the given video, arrangement of actin filaments of skeletal muscle is shown. Actin filament is a thin filament which is formed by a double chain of many subunits. Both the chains are twisted and this resembles the structure of double strands of pearl.

Conclusion

Double strands of pearl resemble twisted double chain of actin filaments formed of many subunits.

Expert Solution

Summary Introduction

(d) To write:

To determine the reason of striated appearance of skeletal muscle.

Introduction:

Skeletal muscles have striated appearance due to presence of alternating dark and light bands in them.

Explanation of Solution

Due to arrangement of myosin and actin filaments, light and dark bands are formed. This gives striated appearance to the skeletal muscle. The A bands forms the dark bands as they have both actin and myosin filaments in them giving a dark appearance. The I bands forms light bands as they have only thin actin filaments in them. This results in striated appearance of a skeletal muscle.

Conclusion

Striated appearance of skeletal muscle is formed by dark A bands and light I bands formed by arrangement of actin and myosin filaments of the muscle.

Answer 8

Expert Solution

Summary Introduction

(a) To write:

The names of junction points between sarcomeres.

Introduction:

Sarcomeres are the units of the skeletal muscle which are formed of muscle fibers. Many sarcomeres together form myofibrils.

Explanation of Solution

Sarcomeres are the units of muscles and junction points between sarcomeres is Z line. In between two Z lines, two sarcomere units are present. At Z line, actin filaments or the ends of sarcomere are present.

Conclusion

Junction points between sarcomeres is known as Z line.

Answer 9

Expert Solution

Answer 10

Expert Solution

Answer 11

Expert Solution

Answer 12

Summary Introduction

(a) To write:

The names of junction points between sarcomeres.

Introduction:

Sarcomeres are the units of the skeletal muscle which are formed of muscle fibers. Many sarcomeres together form myofibrils.

Answer 13

Explanation of Solution

Sarcomeres are the units of muscles and junction points between sarcomeres is Z line. In between two Z lines, two sarcomere units are present. At Z line, actin filaments or the ends of sarcomere are present.

Answer 14

Conclusion

Junction points between sarcomeres is known as Z line.

Answer 15

Expert Solution

Summary Introduction

(b) To write:

The name of subunits of myofibrils.

Introduction:

Myofibrils are elongated thread like structures in the skeletal muscles. Many myofibrils together form skeletal muscles.

Explanation of Solution

The subunit of myofibrils are sarcomeres. Sarcomeres are the basic units of a skeletal muscle which together form myofibrils. These myofibrils together form a skeletal muscle.

Conclusion

Subunits of myofibrils are sarcomeres.

Answer 16

Expert Solution

Answer 17

Expert Solution

Answer 18

Expert Solution

Answer 19

Summary Introduction

(b) To write:

The name of subunits of myofibrils.

Introduction:

Myofibrils are elongated thread like structures in the skeletal muscles. Many myofibrils together form skeletal muscles.

Answer 20

Explanation of Solution

The subunit of myofibrils are sarcomeres. Sarcomeres are the basic units of a skeletal muscle which together form myofibrils. These myofibrils together form a skeletal muscle.

Answer 21

Conclusion

Subunits of myofibrils are sarcomeres.

Answer 22

Expert Solution

Summary Introduction

(c) To write:

To determine what double strands of pearl means in the video.

Introduction:

In the given video double strands of pearl shows the arrangement of actin and myosin filament.

Explanation of Solution

In the given video, arrangement of actin filaments of skeletal muscle is shown. Actin filament is a thin filament which is formed by a double chain of many subunits. Both the chains are twisted and this resembles the structure of double strands of pearl.

Conclusion

Double strands of pearl resemble twisted double chain of actin filaments formed of many subunits.

Answer 23

Expert Solution

Answer 24

Expert Solution

Answer 25

Expert Solution

Answer 26

Summary Introduction

(c) To write:

To determine what double strands of pearl means in the video.

Introduction:

In the given video double strands of pearl shows the arrangement of actin and myosin filament.

Answer 27

Explanation of Solution

In the given video, arrangement of actin filaments of skeletal muscle is shown. Actin filament is a thin filament which is formed by a double chain of many subunits. Both the chains are twisted and this resembles the structure of double strands of pearl.

Answer 28

Conclusion

Double strands of pearl resemble twisted double chain of actin filaments formed of many subunits.

Answer 29

Expert Solution

Summary Introduction

(d) To write:

To determine the reason of striated appearance of skeletal muscle.

Introduction:

Skeletal muscles have striated appearance due to presence of alternating dark and light bands in them.

Explanation of Solution

Due to arrangement of myosin and actin filaments, light and dark bands are formed. This gives striated appearance to the skeletal muscle. The A bands forms the dark bands as they have both actin and myosin filaments in them giving a dark appearance. The I bands forms light bands as they have only thin actin filaments in them. This results in striated appearance of a skeletal muscle.

Conclusion

Striated appearance of skeletal muscle is formed by dark A bands and light I bands formed by arrangement of actin and myosin filaments of the muscle.

Answer 30

Expert Solution

Answer 31

Expert Solution

Answer 32

Expert Solution

Answer 33

Summary Introduction

(d) To write:

To determine the reason of striated appearance of skeletal muscle.

Introduction:

Skeletal muscles have striated appearance due to presence of alternating dark and light bands in them.

Answer 34

Explanation of Solution

Due to arrangement of myosin and actin filaments, light and dark bands are formed. This gives striated appearance to the skeletal muscle. The A bands forms the dark bands as they have both actin and myosin filaments in them giving a dark appearance. The I bands forms light bands as they have only thin actin filaments in them. This results in striated appearance of a skeletal muscle.