At right are pictures showing a part①Fully relaxed sarcomere of a muscle fiberof a skeletal muscle cell when it isrelaxing and after it has contractedfully.1. Label the following components:• Actin/thin filament• Myosin/thick filament• SarcomereН2. Skeletal muscle cells are said tobe striated, striped. Alternatingdark and light stripes can be seenunder a light microscope; moredetail is shown in the electronmicrographs (EMS) at right.Compare the top EM, which showsone dark vertical stripe (taking upabout the middle third of thepicture) flanked by two whitestripes (taking up the rest of thepicture). What protein's presenceor absence appears to cause thedark and light stripes?②Fully contracted sarcomere of a muscle fiberFigure: E. Marieb & K. Hoehn, HumanAnatomy & Physiology (2016).

Answered: Image /qna-images/answer/0f2c0ddb-cb60-4a8b-b029-1b6fb8937d22.jpg

Answered: At right are pictures showing a…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Similar questions

In which type of muscle fibers is ATP synthesized aerobically in mitochondria? smooth cardiac skeletal all of the above 2. In which types of muscle fibers are action potentials transmitted from one cell to the next through gap junctions? unitary smooth and cardiac cardiac and skeletal skeletal and smooth 3. All types of muscle have actin and myosin, but not all types have sarcomeres." True False
Write the name of the sarcomere structure defined. A structure may be used more than once, and a definition may apply to more than one structure. ______________________ 1. Length does not change when sarcomere shortens. ______________________ 2. This area is the length of thick filaments. ______________________ 3. Center point of attachment for thick filaments. ______________________ 4. Length decreases when sarcomere shortens. ______________________ 5. This area contains only thin filaments. ______________________ 6. Point of attachment for thin filaments. ______________________ 7. This area contains only thick filaments. ______________________ 8. This area contains overlapping thin and thick filaments. ______________________ 9. The area from Z disc to Z disc. ______________________ 10. This area disappears in a fully contracted muscle
When utilizing microprocessor technology for testing muscle strength, you are typically looking at what form of muscle contraction? Concentric Isokinetic Isometric Eccentric
Describe what is happening to the following parts of a sarcomere during muscle contraction. a. H band b. I band c. A band d. Z lines
Determine whether the following description is common to skeletal muscle, cardiac muscle or both skeletal and cardiac muscle. increase in tension during contraction of the muscle organ involves recruitment of other cells is primarily under the control of the autonomic nervous system all cells depolarize and contract during every contraction of the muscle organ different neurotransmitters can increase or decrease the rate of contraction action potentials begin electrical depolarization by a voltage-gated Na+ channel 1. skeletal muscle 2. cardiac muscle increase in cytosolic 3. skeletal muscle and cardiac muscle calcium increases tension in muscle cells prolonged depolarization is due to Ca2+ influx across the plasma membrane contraction is not under the control of hormones relaxation occurs when cytosolic calcium is reduced to resting levels increase in tension during contraction of single cells is associated with a higher frequency of action potentials
Draw a graph of the isometric force–length relationshipof striated muscle, indicating where maximal overlap betweenactin and myosin filaments occurs.
Which of the following regions of a sarcomere does not change length during a contraction because it represents the length of the thick myosin filaments. Group of answer choices Z disk H band A band I band
What causes relaxation in a skeletal muscle fiber Select one: a. Myosin remains attached to actin b. Calcium is pumped away from myofibrils c. Voltage gated potassium channels open d. Voltage gated sodium channels inactivate
Complete the following statements about the structure of the different muscle types. Not all choices will be used.
What type of action potential conduction is found on the surface of skeletal muscle cell? continuous conduction saltatory conduction the most common cause of muscle cramps is low potassium. True :/ false
Indicate which of the following are true. Chronically shortened muscles will lose sarcomeres in series in order to maintain ideal amounts of myofilament overlap. Contractile force is proportional to the length of a muscle. Muscle organ contraction is all or nothing. Muscle cells are surrounded by an endomysium. Actin is the thick filament and Z-lines are where the cross-bridges zig-zag to adjacent actin filaments. Muscles with fewer motor units are weaker, i.e., capable of less force. A nerve impulse, calcium, and ATP are necessary for muscle contraction. Tendons attach bones to bones and help to limit the range of motion at joints. Muscle tissue is very dynamic and will respond to chronic stress by becoming stronger (making more myofilaments), chronic contraction by becoming shorter (losing sarcomeres in series), and stretching by becoming longer (adding sarcomeres in series). Myofilaments are actually long strands of proteins.
Now in your own words, EXPLAIN (1) howa neural impulse is transferred to a muscle cell this is the process of “muscle excitation"), and (2) how the electrical impulse travels into he T-tubules and causes calcium to be released from the sarcoplasmic retículum (this is the process of “excitation-contraction coupling"): OMADidoinos reticulum 5. se mo S1e hosph erah anism

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