Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 35, Problem 5TY
Summary Introduction
Introduction:
Thick filament consists of a core of elastic protein that is known as titin. Titin extends from each end of the thick filament across the I band to the Z line on each side. Titin is referred to as molecular spring as it recoils after stretching. Thick filaments also contain about 300 myosin molecules that are made up of pair of myosin subunits that are twisted around each other.
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Which of the following happens within the sarcomere during muscle contraction?
The myosin filaments "walk" along the actin filaments bidirectionally towards the Z lines.
The myosin filaments shorten.
The actin filaments shorten.
The H bands and I bands both increase in width.
In the process of muscle contraction, which of the following steps requires hydrolysis of ATP to complete?
movement of myosin head, pulling the thin filament
binding of myosin head to active site on actin
resetting of the myosin head back to its ready position
letting go of myosin head from the active site on actin
sliding of tropomyosin causing exposure of actin
Pick the right order for muscle contraction
a) ATP attaches to myosin, muscle cell uses calcium, action potential spreads
b) Calcium release, binding sites on actin are exposedmyosin binds to actin
c) Myosin binds to actin, myosin uses calcium, cell gets shorter
d) Action potential is received , cell gets shorter, myosin grabs actin
Chapter 35 Solutions
Principles of Biology
Ch. 35.1 - Prob. 1CCCh. 35.1 - Prob. 1TYKCh. 35.1 - Prob. 2TYKCh. 35.2 - Prob. 1CCCh. 35.2 - Rigor mortis is the condition that occurs shortly...Ch. 35.2 - Prob. 1BCCh. 35.2 - Prob. 3CCCh. 35.2 - Prob. 2BCCh. 35.2 - Prob. 1TYKCh. 35.2 - Prob. 2TYK
Ch. 35.3 - Prob. 1TYKCh. 35.4 - Prob. 1TYKCh. 35.4 - Prob. 2TYKCh. 35 - Prob. 1TYCh. 35 - Which, if any, of the following is not a function...Ch. 35 - Prob. 3TYCh. 35 - Prob. 4TYCh. 35 - Prob. 5TYCh. 35 - During cross-bridge cycling, binds to _________,....Ch. 35 - Prob. 7TYCh. 35 - Prob. 8TYCh. 35 - Prob. 9TYCh. 35 - Prob. 10TYCh. 35 - Prob. 1CCQCh. 35 - Prob. 2CCQCh. 35 - Prob. 3CCQCh. 35 - Discuss the structure and function of the two...Ch. 35 - Prob. 2CBQ
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- Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the abovearrow_forwardThe _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filamentarrow_forwardAfter death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.arrow_forward
- Why do you think a person is able to perform anaerobic exercise (such as lifting and holding a heavy weight) only briefly but can sustain aerobic exercise (such as walking or swimming) for long periods? (Hint: Muscles have limited energy stores.)arrow_forwardWhich of the following are correct Dynein head elongates like a lever arm. ATP hydrolysis detaches myosin from actin Myosin slides over both thick and thin actin filaments ATP hydrolysis drives change in conformation of the myosin head.arrow_forwardDuring muscle contraction, the cross-bridge detaches when ________.a. the myosin head binds to an ADP moleculeb. the myosin head binds to an ATP moleculec. calcium ions bind to troponind. calcium ions bind to actinarrow_forward
- Which of the following statements best describes the sliding filament mechanism of muscle contraction? a. Actin and myosin filaments do not shorten, but rather, slide past each other. b. Actin and myosin filaments shorten and slide past each other. c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten. d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.arrow_forwardWhich of the following statements regarding contraction of skeletal muscle cells is NOT true: (more than one answer may be correct) the myofibrils shorten the thick and thin filaments slide past one another the thin filaments shorten the sarcomeres shorten the thick filaments shortenarrow_forwardWhich of the following statements is true?a. Fast fibers have a small diameter.b. Fast fibers contain loosely packed myofibrils.c. Fast fibers have large glycogen reserves.d. Fast fibers have many mitochondriaarrow_forward
- Which of the following lists the structures from largest to smallest?a. motor unit, muscle, myofibril, muscle fiber, thick and thin filamentsb. muscle, muscle cell, myofibril, muscle fiber, actin and myosinc. muscle cell, thick and thin filaments, sarcomere, myofibrild. muscle, muscle fiber, myofibril, thick and thin filamentsarrow_forwardThe sliding filament model depicts how myosin motors attached to actin lead to muscle contraction. This process proceeds in a precise series of events. Indicate which of the following shows the correct order of steps in the sliding filament model. Group of answer choices Myosin binds ATP; myosin tightly binds actin; power stroke; myosin releases actin Myosin binds GTP; myosin releases actin; power stroke; myosin tightly binds actin Actin binds ATP; power stroke; myosin tightly binds actin; actin releases ADP Actin binds ADP; myosin releases actin; power stroke; actin releases ADParrow_forwardDuring muscular contraction, cross-bridges form between _____ and _____ . Multiple Choice a) myosin, tropomyosin b) myosin, troponin c) troponin, calmodulin d) actin, tropomyosin e) actin, myosinarrow_forward
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