Human Anatomy
9th Edition
ISBN: 9780135168059
Author: Marieb, Elaine Nicpon, Brady, Patricia, Mallatt, Jon
Publisher: Pearson Education, Inc.,
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Chapter 10, Problem 6RQ
Summary Introduction
To determine:
The role of T tubules in the contraction of muscles.
Introduction:
The process of activation of tension-producing sites in muscle fibers is known as muscle contraction. The muscles contract when the motor neurons send impulses to the muscles for contraction. The muscle contraction is an important process needed for the movement of organs, locomotion, and breathing.
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Students have asked these similar questions
A muscle fiber is the same thing as a:
a) myofibril.
b) myocyte.
c) myofilament.
d) fascicle.
If a muscle cell had very short T-tubules, how much tension would the muscle fiber create, relative to a normal muscle fiber? Assume sarcoplasmic reticulum can still react to activity at the neuromuscular junction.
a)Less tension would be created.
b) No difference in tension creation.
c) More tension would be created.
d) No tension would be created.
Which of the following causes ( the state of ) rigor in skeletal muscle ?a) lack of atp
b) decrease of intracellular ca2plus
c) increase in intracellular ca2+
d) lack of action potential in motor neurons
Chapter 10 Solutions
Human Anatomy
Ch. 10 - What structural similarities are shared by all...Ch. 10 - Prob. 2CYUCh. 10 - Prob. 3CYUCh. 10 - What are the functional definitions of the origin...Ch. 10 - Place the following structures in order from...Ch. 10 - Which myofilaments are found only in the A band?Ch. 10 - Prob. 7CYUCh. 10 - Prob. 8CYUCh. 10 - Prob. 9CYUCh. 10 - Prob. 10CYU
Ch. 10 - Prob. 11CYUCh. 10 - Prob. 12CYUCh. 10 - Prob. 13CYUCh. 10 - Prob. 14CYUCh. 10 - The connective tissue that lies just outside the...Ch. 10 - Prob. 2RQCh. 10 - Prob. 3RQCh. 10 - Prob. 4RQCh. 10 - Prob. 5RQCh. 10 - Prob. 6RQCh. 10 - Prob. 7RQCh. 10 - Prob. 8RQCh. 10 - Prob. 9RQCh. 10 - Prob. 10RQCh. 10 - Prob. 11RQCh. 10 - Prob. 12RQCh. 10 - Define motor unit.Ch. 10 - List the structural differences between the three...Ch. 10 - Cindy Wong was a good anatomy student, but she...Ch. 10 - Prob. 16RQCh. 10 - Prob. 17RQCh. 10 - Where is titin located, and what are its...Ch. 10 - What is the general distribution of skeletal...Ch. 10 - Prob. 1CRCAQCh. 10 - Prob. 2CRCAQCh. 10 - Chickens are capable of only brief bursts of...Ch. 10 - Takashi, an osteopathic physician, saw that Mrs....Ch. 10 - Why are muscle infections relatively rare...Ch. 10 - As a sprinter, Lateesha knew that the best way to...Ch. 10 - Prob. 7CRCAQCh. 10 - Prob. 8CRCAQCh. 10 - Prob. 9CRCAQ
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- In a general sense, how do skeletal muscles produce movement?arrow_forwardHow does a muscle fiber incur an oxygen debt?arrow_forwarda) At what time point would a muscle begin to fatigue? Comment on the percentage decrease in contraction force by the end of a stimulus. b) Provide a possible mechanism for why would a muscle won't be able to maintain a prolonged contraction. c) Would the results be different if it was from smooth muscle tissue? Why?arrow_forward
- 14) after a muscle fiber has contracted, the calcium a) is secreted by the Golgi apparatus b) is chemically bound to the myofilaments c) renters the sarcoplasmic reticulum d) is destroyedarrow_forward31) which of the following are included in a triad found in skeletal muscle? a) actin, myosin and calcium b) an axon terminal, synaptic cleft and sarcolemma c) A T tubule and two adjacent terminal cisterns d) Larry, moe and curlyarrow_forwardWhat causes a muscle cell to contract? A) ATP forms a bridge binding actin to myosin. B) Calcium ions form a bridge binding actin to myosin. C) Actin and myosin break down. D) Actin heads attached to myosin bend. E) Myosin heads attached to actin bend.arrow_forward
- Slow twitch muscle fibers are characterized by all of the following EXCEPT: O a) used in endurance type of activities O b) contract rapidly and forcefully Oc) resistant to fatigue O d) have a direct relationship to the oxidative energy systemarrow_forwardFast twitch muscle fibers are characterized by all of the following EXCEPT: a) fatigue resistant O b) direct relationship to the anaerobic energy system O c) rapid contraction O d) used in sprintingarrow_forwardWhat happens to sarcomeres when actin and myosin filaments in a muscle fiber interact during the contraction phase? A) sarcomeres usually fatigue B) sarcomeres usually get shorter C) sarcomeres usually get longer D) sarcomeres stay the samearrow_forward
- During the contraction of a vertebrate skeletal muscle fiber,calcium ions(A) break cross-bridges as a cofactor in hydrolysis of ATP.(B) bind with troponin, changing its shape so that the myosinbinding sites on actin are exposed.(C) transmit action potentials from the motor neuron to themuscle fiber.(D) spread action potentials through the T tubules.arrow_forwardIn skeletal muscle contraction, calcium ions apparently act to: Question 8 options: a) block the channels of the voltage gated sodium channels b) move the tropomyosin so it’s no longer blocking the active sites of the actin c) release the inhibition on Z discs d) cause ATP binding to actinarrow_forwardSmooth muscles relax when: a) myosin kinase phosphorylates the myosin head b) myosin phosphatase removes a phosphate group from myosin c) Ca2 + binds to calmodulin d) Ca2 + flows out of the sarcoplasmic reticulumarrow_forward
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