MindTap Biology, 1 term (6 months) Printed Access Card for Starr/Taggart/Evers/Starr's Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305269842
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Textbook Question
Chapter 35, Problem 8SQ
In sarcomeres, phosphate-group transfers from ATP activate _______.
- a. actin
- b. myosin
- c. troponin
- d. Z bands
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When sarcomeres contract during muscle contraction, which of the following occurs?
A.
The myosin filaments lengthen.
B.
The myosin filaments "walk" along the actin microfilaments.
C.
The myosin filaments shorten.
D.
The actin filaments shorten.
What does ATP binding to myosin head triggers?
a.
Its association with microtubules
b.
Its dissociation from actin microfilament
c.
Conformational change and rotation of myosin head
d.
Its association with actin microfilament
The sliding filament mechanism describes the process during which: a. actin and myosin slide relative to each other b. sarcomeres slide relative to each other c. troponin and tropomyosin slide relative to each other d. muscle fibers slide past each other
Chapter 35 Solutions
MindTap Biology, 1 term (6 months) Printed Access Card for Starr/Taggart/Evers/Starr's Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 35 - An endoskeleton consists of _________. a. a fluid...Ch. 35 - Bones are __________. a. mineral reservoirs b....Ch. 35 - Bones move when __________ muscles contract. a....Ch. 35 - A ligament connects ________. a. bones at a joint...Ch. 35 - Building Better Bones Tiffany, shown in FIGURE...Ch. 35 - Building Better Bones Tiffany, shown in FIGURE...Ch. 35 - Building Better Bones Tiffany, shown in FIGURE...Ch. 35 - Building Better Bones Tiffany, shown in FIGURE...Ch. 35 - Parathyroid hormone stimulate__________. a. bone...Ch. 35 - The ___ attaches to the pelvic girdle. a. radius...
Ch. 35 - The __________ is the basic unit of contraction....Ch. 35 - In sarcomeres, phosphate-group transfers from ATP...Ch. 35 - A sarcomere shortens when ________. a. thick...Ch. 35 - Muscle fibers produce ATP by__________. a. aerobic...Ch. 35 - Prob. 11SQCh. 35 - A motor unit is _________. a. a muscle and the...Ch. 35 - __________from a motor neuron excites a muscle...Ch. 35 - Prob. 14SQCh. 35 - Match the words with their defining feature....Ch. 35 - Continued strenuous activity can cause lactate to...Ch. 35 - After death, calcium pumps no longer function and...
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- Single-unit smooth muscle cells can stimulate each other because they havea. a latch-bridge.b. diffuse junctions.c. gap junctions.d. tight junctions.e. cross-bridges.arrow_forwardmuscle cells are made up of? A. Z bars b. actin c. myosin d. myofibrilsarrow_forwardAccording to the sliding filament model, when muscles contract,a. sarcomeres shorten.b. myosin heads break down ATP.c. actin slides past myosin.d. the H zone disappears.e. All of these are correctarrow_forward
- What is released when myosin heads attach to actin filaments A. Phosphate B. ATP C. ADP D. Tropomyosinarrow_forwardThe function of Ca2+ in skeletal muscle contraction is toa. cause an allosteric change in myosin so it detaches from actin.b. provide the energy necessary for the movement of the cross-bridge.c. expose the myosin-binding sites on the thin filaments.d. bind to tropomyosin.e. do a and c only.arrow_forwardIdentify the organelle most likely responsible for each cellular job within skeletal muscle a) Assemble myosin and actin (proteins which contract) b) Houses the genes c) Sorts any proteins produced d) ATP is generated e) Breaks down old or damaged myosin and actinarrow_forward
- After 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_forwardWhich component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striationsarrow_forwardThe function of ATP during muscle contraction is toa. cause an allosteric change in myosin so it detaches from actin.b. provide the energy necessary for the movement of the cross-bridge.c. expose the myosin-binding sites on the thin filaments.d. do all of the above.e. do a and b only.arrow_forward
- Myosin binds to actin, then bends. What is ATP needed for next? A. to pump the Ca++ “keys” back into the sarcoplasmic reticulum B. to replace the strap and cover the binding sites C. to give feedback to the neuron that contraction occurred D. to un-bind myosin from actin and re-set for another powerstroke.arrow_forwardMuscle relaxation occurs when ________. a. calcium ions are actively transported out of the sarcoplasmic reticulum b. calcium ions diffuse out of the sarcoplasmic reticulum c. calcium ions are actively transported into the sarcoplasmic reticulum d. calcium ions diffuse into the sarcoplasmic reticulumarrow_forwardThis thick filament motor protein composed of 6 polypeptide chains uses ATP hydrolysis to interact creating a powerstroke for skeletal muscle contractions. A Myosin B Actin C Titin D Tropomyosinarrow_forward
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