BIOLOGY
5th Edition
ISBN: 9781265202859
Author: BROOKER
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Chapter 27.2, Problem 1CC
Structure and Movement
Concept Check: Does the filament move more like the arms of a human swimmer or the shaft of a boat propeller?
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VISUAL SKILLS What will happen in a muscle cell thathas used up its supply of oxygen and ATP? (ReviewFigures 9.18 and 9.20.)
BIO168 Human Anatomy & Physiology I
Practice Worksheet B
Sequence of muscle contraction
Number the following statements in their proper sequence to describe the contraction mechanism in a skeletal muscle cell.
_____ A. Acetylcholine is released into the neuromuscular junction by the axonal terminal.
_____ B. The action potential, carried deep into the cell, causes the sarcoplasmic reticulum to release calcium ions.
____ C. The muscle cell relaxes and lengthens.
_____ D. Acetylcholine diffuses across the neuromuscular junction and binds to receptors on the sarcolemma.
____ E. The calcium ion concentration at the myofilaments increases; the myofilaments slide past one another, and the cell shortens.
_____ F. Depolarization occurs, and the action potential is generated.
_____ G. As calcium is actively reabsorbed into the sarcoplasmic reticulum, its concentration at the myofilaments decreases.
please asnwer 4,5
no explanation needed just the answer
Chapter 27 Solutions
BIOLOGY
Ch. 27.2 - Core Skill: Connections Look ahead to Section...Ch. 27.2 - Prob. 2CSCh. 27.2 - Structure and Movement Concept Check: Does the...Ch. 27.2 - Prob. 3CSCh. 27.3 - Prob. 1CCCh. 27.5 - Prob. 1EQCh. 27.5 - Prob. 2EQCh. 27 - Which of the following features is common to...Ch. 27 - The bacterial phylum whose members typically...Ch. 27 - Gram-staining is a procedure that microbiologists...
Ch. 27 - Place the following steps in the correct order,...Ch. 27 - What ecological role do cyanobacteria play? a....Ch. 27 - Prob. 6TYCh. 27 - Prob. 7TYCh. 27 - Prob. 8TYCh. 27 - Prob. 9TYCh. 27 - Prob. 10TYCh. 27 - Prob. 1CQCh. 27 - Prob. 2CQCh. 27 - Prob. 3CQCh. 27 - Prob. 1COQCh. 27 - Prob. 2COQ
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- Evaluate and Synthesize 9. INTERPRET DATA Examine Figure 40-13. Based on the summation of two stimuli shown in that graph, draw a curve showing summation when the muscle fiber is stimulated three times. Figure 40-13 Summation and tetanusarrow_forwardVhat are the two types of muscle movement categories? Give an example for both. Describe Swammerdam's experiment and Galvani's experiment with frog legs. What did they tell us about muscle contraction? What is the sliding-filament model for muscle contraction? Describe the role of actin and myosin of sarcomeres in the model (be specific). Describe how an action potential triggers muscle contraction. Know the specific molecules involved. . Describe the structural and functional differences between smooth, cardiac and skeletal muscles. What are the three types of skeletal muscle fibers and how do they differ in structure and function? Next « Previous MacBook Proarrow_forwardWork 4. Schemes of myocardial sarcomere and organization of fine sarcomere filaments. Indicate in the picture: 1. Membrane of muscle fibers. 2. Z-disk. 3. T-system. 4. Sarcoplasmic reticulum. 5. Actin filaments 6. Myosin filaments. Img. 9. Scheme of sarcomere structure of myofibrils of muscle fibers of skeletal muscle. The thick threads are formed by the contractile protein Thin threads are formed by contractile protein Control proteins troponin and tropomyosin are associated with thick or thin threads? Calcium binding control protein is: Img. 10. Scheme of the structure of the actin threads. Indicate in the picture: 1. Actin globules. The energy of ATP in the cycle of contraction-relaxation of 2. Troponin. skeletal muscle is being spent on: 3. Tropomyosin.arrow_forward
- Work 6. Comparison of physiological properties of different types of muscles. TABLE 4. SKELETAL MUSCLES SMOOTH MUSCLES RESTING POTENTIAL (LEVEL, IN MV) DURATION OF ACTION POTENTIAL CALCIUM-BINDING PROTEINS DURATION OF THE CYCLE CONTRACTION-RELAXATION AYTOMATICITY NTERCELLULAR CONTACTS SENSITIVITY TO BIOLOGICALLY ACTIVE SUBSTANCESarrow_forwardL PHYSIOLOGY - Spring20 fall20 Repetitive stimulation of a skeletal muscle fiber will cause an increase in contractile strength because repetitive stimulation causes an increase in Select one: O a. The velocity of muscle contraction on O b. The number of muscle myofibrils generating tension O c. Concentration of calcium in the myoplasm O d. The duration of cross-bridge cycling Next pagearrow_forwardMolecular Biochemistry Q. Why can’t Myosin V motor proteins “walk” towards the negative end of the actin molecule? Why do most myosins move toward the positive end? Why do most myosins move toward the positive end instead of the negative end? Explainarrow_forward
- Asap quickly fast and easyarrow_forwardMULTIPLE ANSWER QUESTIONS. Select all that apply. Which of the following occurs when the muscle is excited (contracting)? The myosin binding site on the actin thin filaments are covered Ca2+ ion are being released from the sarcoplasmic reticulum into the sarcoplasm Zone of overlap of a sprcomere increases The H-zone of a sarcomere gets larger O The myosin head is NOT attached to the actin thin filament - Previous Nextarrow_forwardphysiology questionarrow_forward
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