EBK HUMAN BIOLOGY
11th Edition
ISBN: 8220100545931
Author: MCMILLAN
Publisher: Cengage Learning US
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Textbook Question
Chapter 6, Problem 5RQ
What is the function of the sarcoplasmic reticulum in muscle cell contraction?
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What are the steps and ions involved in muscle contractions ?
What is the role of ATP and ATP hydrolysis in the cycle of actin-myosin association and disassociation that leads to muscle contraction?
Skeletal muscle cells undergo contractions based on a molecular mechanism involving:
1)the sliding of actin and myosin filaments past each other without any change in filament length
2) the shortening of actin filaments following direct interaction with myosin
3) dynamic instability of microtubules
4)none
Chapter 6 Solutions
EBK HUMAN BIOLOGY
Ch. 6 - In a general sense, how do skeletal muscles...Ch. 6 - In the diagram below, label the fine structure of...Ch. 6 - How do actin and myosin interact in a sarcomere to...Ch. 6 - How does a muscle fiber incur an oxygen debt?Ch. 6 - What is the function of the sarcoplasmic reticulum...Ch. 6 - Explain why (a) calcium ions and (b) ACh are vital...Ch. 6 - What is a motor unit? Why does a rapid series of...Ch. 6 - What are the structural and functional differences...Ch. 6 - Prob. 1SQCh. 6 - Prob. 2SQ
Ch. 6 - Prob. 3SQCh. 6 - The _____ is the basic unit of muscle contraction....Ch. 6 - Skeletal muscle contraction requires _________. a....Ch. 6 - Nerve impulses first stimulate a skeletal muscle...Ch. 6 - Prob. 7SQCh. 6 - Prob. 8SQCh. 6 - Prob. 9SQCh. 6 - Prob. 10SQCh. 6 - You are training athletes for the 100-meter dash....Ch. 6 - Prob. 2CTCh. 6 - Prob. 3CTCh. 6 - At the gym Sean gets on a stair-climbing machine...
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- What roles do actin and myosin play during muscle contraction?arrow_forwardWhat two types of microfilament make up the muscle sarcomere? Which motor protein is primarily involved in muscle contraction?arrow_forwardWhat is the time relationship between a skeletal muscle fiber action potential and the resulting contraction and relaxation of the muscle fiber?arrow_forward
- 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.arrow_forwardWhat factors determine the duration of an isotonic twitch in skeletal muscle? An isometric twitch?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_forward
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