EBK HUMAN BIOLOGY
11th Edition
ISBN: 8220100545931
Author: MCMILLAN
Publisher: Cengage Learning US
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Textbook Question
Chapter 6, Problem 5SQ
Skeletal muscle contraction requires _________.
- a. calcium ions
- b. ATP
- c. arrival of a nerve impulse
- d. all of the above
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In relaxed muscle, the myosin-binding site on actin is blocked by ________. a. titin b. troponin c. myoglobin d. tropomyosin
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In sustained, moderate exercise, skeletal muscle is predominantly using ______________ as its energy source. a. amino acids b. glucagon c. fatty acids d. creatine phosphate
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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- The muscles of a professional marathon runner are most likely to have ________.a. 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibersb. 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibersc. 50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibersd. 40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibersarrow_forwardFlexion of biceps muscles during weight-training is an example of _______________ contraction. a. isotonic b. concentric c. eccentric d. a and b e. a, b, and c Which of the following skeletal muscle fiber structure is part of the “triad”? a. t-tubule b. terminal cisternae of the SR c. sarcomere d. a and b e. a, b, and carrow_forwardThe actual contractile units of muscle, called _____, extend from middle of one _____ to middle of next along length of myofibrils. A. T tubule, M line B. sarcoplasmic reticulum, H zone C. sarcomeres, I band D. sarcolemma, A bandarrow_forward
- The muscles of a professional sprinter are most likely to have ________.a. 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibersb. 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibersc. 50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibersd. 40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibersarrow_forwardMuscle fatigue is caused by ________. a. buildup of ATP and lactic acid levels b. exhaustion of energy reserves and buildup of lactic acid levels c. buildup of ATP and pyruvic acid levels d. exhaustion of energy reserves and buildup of pyruvic acid levelsarrow_forwardIn muscle contraction, when nervous stimulation ___, it causes Ca2+ to be ___ the sarcoplasmic reticulum. a. stops; pumped back to b. begins; pumped from c. stops; pumped from d. a and b e. b and carrow_forward
- During muscle contraction, calicum ions bind to A. Actin Filaments B. Tropomyosin C. Troponin D. Myosin Filamentsarrow_forwardThe type of muscle cell under voluntary control is the ________. a. smooth muscle b. skeletal muscle c. cardiac muscle d. visceral musclearrow_forwardThe names of the muscles can indicate all of the following, EXCEPT ___________. a.myofibril numbers of the muscle b.the direction of the muscle relative to the long axis of the body c.action of the muscle d.the region of the body where the muscle is located 2. An exocrine gland that loses small parts of its cell bodies during secretion, as is the case for the mammary gland, is further classified as a ____________ gland. a.Endocrine b.Merocrine c.Holocrine d.Apocrinearrow_forward
- The muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous stimulation is still present in the synapse. The activity of ________ helps to remove this neurotransmitter. a. myosin b. action potential c. tropomyosin d. acetylcholinesterasearrow_forwardContraction of muscles requires binding of various components of muscle fiber. Which of the following rows correctly matches two components of muscle fibre that bind with each other? Row Component of muscle fibre Component of muscle fibre A. Ca2+ myosin B. troponin myosin C. troponin tropomyosin D. actin Ca2+arrow_forward5. Cardiac muscle cells have the unique ability to demonstrate ________. A. graded strength B. tetanus C. isotonic contraction D. self-excitationarrow_forward
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