Essentials of Human Anatomy & Physiology (12th Edition)
12th Edition
ISBN: 9780134395326
Author: Elaine N. Marieb, Suzanne M. Keller
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 2MC
After ACh attaches to its receptors at the neuromuscular junction, what is the next step?
a. Sodium channels open.
b. Calcium binds to regulatory proteins on the thin filaments.
c. Cross bridges attach.
d. ATP is hydrolyzed.
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Students have asked these similar questions
The Sarcomere 2
Thin filaments are often named for which protein?
a. actin
b. myosin
c. troponin
d. tropomyosin
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
Which of the following statements are true of the neuromuscular junction? (Read carefully and select all the correct statements.)
A.
A synapse is the space between two muscle fibers.
B.
Acetylcholine is released from vesicles in the sarcolemma.
C.
The axon terminal is the end of a sensory neuron.
D.
Acetylcholine makes the sarcolemma more permeable to calcium ions.
E.
Cholinesterase is an enzyme that destroys acetylcholine so that the impulse will continue at the same strength.
F.
The receptors for acetylcholine are in the sarcolemma.
Chapter 6 Solutions
Essentials of Human Anatomy & Physiology (12th Edition)
Ch. 6 - If you compare electron micrographs of a relaxed...Ch. 6 - After ACh attaches to its receptors at the...Ch. 6 - Your ability to lift that heavy couch would be...Ch. 6 - 4. Doing the pincer grasp is an ___________...Ch. 6 - 5. Which are ways in which muscle names have...Ch. 6 - 6. Which of the following muscles attach to the...Ch. 6 - Which of these thigh muscles causes movement at...Ch. 6 - 8. Which of the following insert on the...Ch. 6 - What is major function of muscle?Ch. 6 - Compare skeletal, smooth, and cardiac muscles in...
Ch. 6 - What two types of muscle tissue are striated?Ch. 6 - 12. Why are the connective tissue wrappings of...Ch. 6 - Prob. 13SAECh. 6 - Prob. 14SAECh. 6 - Prob. 15SAECh. 6 - Prob. 16SAECh. 6 - Prob. 17SAECh. 6 - Prob. 18SAECh. 6 - 19. List the 12 body movements studied in this...Ch. 6 - Prob. 20SAECh. 6 - If you were alternately contracting and relaxing...Ch. 6 - The sternocleidomastoid muscles help to flex the...Ch. 6 - Prob. 23SAECh. 6 - Name the prime mover of elbow flexion. Name its...Ch. 6 - Prob. 25SAECh. 6 - The hamstring and quadriceps muscle groups are...Ch. 6 - 27. What two-bellied muscle makes up the calf...Ch. 6 - 28. What happens to muscles when they are...Ch. 6 - Prob. 29SAECh. 6 - 30. Should a triathlete engage in aerobic or...Ch. 6 - Prob. 31SAECh. 6 - Prob. 32SAECh. 6 - Prob. 33CTCh. 6 - Prob. 34CTCh. 6 - Prob. 35CTCh. 6 - 36. When Eric returned from jogging, he was...Ch. 6 - 37. Chemical A binds and blocks acetylcholine...Ch. 6 - Kendra’s broken leg was in a cast for 8 weeks....
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- What do skeletal muscle contractions share in common with smooth muscle contractions?a. Both types of contractions do not require calcium ions for a contraction to occur.b. Both types of contractions generate little force or a weak force.c. Both types of contractions consume very little ATP.d. Both types of contractions result from thick and thin filaments sliding past one another.arrow_forwardThe primary function of satellite cells is to: a. stabilize motor neuron connection to the myofiber b. support the cells of the perimysium c. repair skeletal muscle following injury d. facilitate the connection between cardiac cellsarrow_forwardWhat structure in skeletal muscle cells functions in calcium storage? a.myofibrillar network b.sarcoplasmic reticulum c.intermediate filament network d.mitochondriaarrow_forward
- What event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation? a. stimulation of ACh receptors b. diffusion of Na* back into transverse tubules c. return of Ca2+ into the sarcoplasmic reticulum d. breaking of the bond with tropomyosinarrow_forwardBotulism toxin inhibits the release of acetylcholine at the neuromuscular junctions. What effect does this have on the muscle activity? a. Muscles will contract continuously. b. Muscles will contract sporadically, without conscious control. c. Muscles will not contract because they will not receive nerve stimulation. d. There will be no effect on muscle activityarrow_forwardWhat happens at a neuromuscular junction?a. An electrical impulse causes the release of a chemical.b. Acetylcholine is released by the muscle cell.c. Acetylcholinesterase is released from the nerve cell.d. A neurotransmitter is released.e. Acetylcholine fits into receptors on the muscle cell.arrow_forward
- What structure on a muscle fiber is composed of largely two varieties of contractile proteins--actin and myosin--which slide past each other during muscle activity to bring about shortening or contraction of muscle cells? A. myofilament B. sarcoplasmic reticulum C. transverse tububle D. sarcomeresarrow_forwardWhich of the following statements about the Ca2+ release channels in the sarcoplasmic reticulum is false? a.They are also called ryanodine receptors. b.They are one-tenth the size of the voltage-gated Ca 2+channels. c.They are opened by Ca2+release channels in the transverse tubules. d.They permit Ca 2+ to diffuse into the sarcoplasm from the sarcoplasmic reticulum.arrow_forwardWhich of the following could prevent skeletal muscle from contracting? Select one or more: a. Preventing calcium from surrounding myofibrils. b. Maintaining high levels of calcium around myofibrils c. Preventing sodium from entering a cell d. Allowing constant entry of sodium into a cellarrow_forward
- Which of the following is a component of the neuromuscular junction? a. axon terminal of a somatic motor neuron b. synaptic cleft c. junctional folds of the sarcoplasmic reticulum d. a and b e. a, b, and carrow_forwardMyosin 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_forwardWhat role (function) does calcium have within a muscle fiber? a. trigger muscle potentials along t-tubules b. trigger contraction by causing the formation of cross bridges c. trigger exocytosis of ACh across the synaptic space d. trigger action potentials along axons e. open voltage gates within the sarcoplasmic reticulum 2. Which of the following are regulatory proteins that allow a muscle fiber to contract when calcium is present? (select all that apply) dystrophin troponin myosin tropomyosin actin 3. During this phase of an action potential, potassium ions exit the cell through voltage gated potassium channels. a. depolarization b. repolarization c. glycolysis d. cross bridge formationarrow_forward
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