EBK HUMAN BIOLOGY
11th Edition
ISBN: 9780100545939
Author: MCMILLAN
Publisher: YUZU
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Chapter 6, Problem 10SQ
Summary Introduction
To match: The M words with their defining features.
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The 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 band
During muscle contraction, the cross-bridge detaches when ________.a. the myosin head binds to an ADP moleculeb. the myosin head binds to an ATP moleculec. calcium ions bind to troponind. calcium ions bind to actin
In relaxed muscle, the myosin-binding site on actin is blocked by ________. a. titin b. troponin c. myoglobin d. tropomyosin
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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- During muscle contraction, calicum ions bind to A. Actin Filaments B. Tropomyosin C. Troponin D. Myosin Filamentsarrow_forwardThe 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_forwardThe 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_forward
- Which region of the sarcomere does not change length between muscle relaxation and muscle contraction A. A band B. Z disc C. I Band D. H Zonearrow_forwardDuring muscle contraction, the I band a. hides the H zone. b. shortens or narrows. c. overlaps the Z line. d. always remains the same length.arrow_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_forward
- Which of these increases the least as a result of muscle hypertrophy?a. number of sarcomeres d. blood vessels and mitochondriab. number of myofibrils e. connective tissuec. number of muscle fibersarrow_forwardMuscle Cell Anatomy 2 Glycogen is stored in which region of a muscle fiber? a. sarcoplasm b. sarcolemma C. sarcoplasmic reticulum d. T-tubulesarrow_forwardUnlike skeletal muscle cells, cardiac muscle cells________." A do not use the sliding filament mechanism of contraction B are not striated C do not rely on an influx of Ca+2 for contraction to occur D do not require neural stimulation to contractarrow_forward
- All muscles attach to bone or connective tissue at no fewer than two points including an origin and insertion. Muscle contraction causes the _________ to move towards the __________. a. insertion; origin b. origin; origin c. origin; insertion d. insertion; insertion e. none of the abovearrow_forwardMatch the appropriate definition to the appropriate vocabulary word. The Herir A. Agonist ps generatem B. Aponeurosis ce che C. Extensibility D. Smooth muscle tive E. Cardiac muscle F. Motor-unit recruitment tains by G. Achilles Tendon er a sh t tim snive H. Synergist Sue I. Myofibrils e tis J. Fatigue en the t ier d f K. Type lla (fast oxidative glycolytic) A decreased ability for a muscle to sustain or generate force/tension. L. Muscles Muscle tissue that directly attaches to bone and is under voluntary control M. Type llx (fast glycolytic) N. Wave summation All the muscle fibers contracts together to generated the most amount of force/tension. O. Inguinal Ligament P. Elasticity A muscle fiber that fatigues the least, uses mostly oxidative phosphorylation, and generate the least amount of force. Q. Motor-unit A discrete group of specific type of muscle fibers innervated by a single R. Excitability motor neuron. A hierarchy of types of motor units recruited during contraction. S.…arrow_forwardPart B Matching Choose the appropriate words or phrases from column "B" that match the terms in column "A." Words or phrases in column "B" may only be used once. Column B Column A 13. Elasticity A. Every one fires B. Binds muscle fibres together 14. Neuromuscular junction C. Muscle's ability to stretch 15. Myosin D. Attaches to troponin 16. Perimysium E. Has a "head and tail" 17. Neurotransmitter Sarcolemma F. Acetylcholine 18. G. muscle membrane 19. Calcium H. Where nerve contacts muscle 20. All-or-none-principlearrow_forward
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