Essentials of Human Anatomy & Physiology, Books a la Carte Edition (12th Edition)
12th Edition
ISBN: 9780134593647
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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Chapter 6 Solutions
Essentials of Human Anatomy & Physiology, Books a la Carte Edition (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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- Which is a false statement about skeletal muscle structure?a. A myofibril is composed of multiple muscle fibers.b. Most skeletal muscles attach to bones by connective-tissue tendons.c. Each end of a thick filament is surrounded by six thin filaments.d. A cross-bridge is a portion of the myosin molecule.e. Thin filaments contain actin, tropomyosin, and troponin.arrow_forwardWhich of the following statements is True?a. Tendons contract using the sliding filament mechanism.b. Tendons are composed primarily of cartilage fibers.c. Tendons attach bones to bones at joints.d. Tendons attach muscles to bone.arrow_forwardWhat 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_forward
- 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 otherarrow_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_forwardWhich of the following changes takes place when a skeletal muscle contracts?A. Z discs move farther apart.B. Actin filaments contract.C. Myosin filaments contract.D. Sarcomeres become shorter.arrow_forward
- In muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules. If a person has too high a concentration of magnesium ions in the blood, magnesium ions can prevent calcium ions from binding troponin. A) What effect would this have on muscle contraction (strengthen, weaken, or no effect)? B) Use your knowledge of how muscle fibers contract to explain your answer in part A.arrow_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_forwardWhen 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.arrow_forward
- Which statement about striated skeletal muscle is true? A. The tension generated by a muscle is invariable. B. Mechanical summation of twitches in a muscle fiber leads to a graded increase in the tension that is above that generated by a single twitch. C. A single action potential arriving at the neuromuscular junction is not sufficient to cause a muscle fiber to twitch. D. Muscle twitches are able to mechanically sum when Ca2+ is quickly and completely removed from the sarcoplasm between action potentials. E. An action potential in the muscle cell activates contraction by releasing Na+ into the sarcoplasm.arrow_forwardSkeletal, smooth, and cardiac muscle are similar in that they all _____. A are divided into motor units B require calcium in order to contract C undergo mitosis frequently to replace dead or damaged cells D have small round cells connected by gap junctionsarrow_forwardPredict what might happen to a muscle cell that is extensible but not elastic. What if the reverse were true— a muscle cell is elastic but not extensible?arrow_forward
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