BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 32, Problem 11SA
Summary Introduction
Introduction:
A mature skeletal muscle consists of thousands of muscle fibers which are known as myofibrils. These are threadlike proteins which are arranged in identical contractile units called sarcomeres.
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The type of muscle cell under voluntary control is the ________. a. smooth muscle b. skeletal muscle c. cardiac muscle d. visceral muscle
In relaxed muscle, the myosin-binding site on actin is blocked by ________. a. titin b. troponin c. myoglobin d. tropomyosin
Muscle 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 reticulum
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- During muscle contraction, calicum ions bind to A. Actin Filaments B. Tropomyosin C. Troponin D. Myosin Filamentsarrow_forwardStriations, cylindrical cells, and multiple nuclei areobserved in ________.a. skeletal muscle onlyb. cardiac muscle onlyc. smooth muscle onlyd. skeletal and cardiac musclesarrow_forwardThe cells of muscles, myocytes, develop from________.a. myoblastsb. endodermc. fibrocytesd. chondrocytesarrow_forward
- 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_forwardWhich protein is not part of the thin filament in a muscle fiber? A. Actin B. Myosin C. Tropomyosin D. Troponinarrow_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
- Simone Biles, the Olympic Champion in gymnastics, does an insane amount of anaerobic exercise. She would likely have a greater proportion of _________ muscle fibers compared to a world class marathon runner. A. Type VX B. Type XX C. Type II D. Type Iarrow_forwardcatalyzes the reaction that creates creatine phosphate in skeletal muscle A. Creatine phosphatase B. Creatine kinase C. Creatinine synthase D. ATP hydrolysisarrow_forwardMuscle that has a striped appearance is described as being a. elastic b. nonstriated c. excitable d. striatedarrow_forward
- Muscle that has a striped appearance is described asbeing ________.a. elasticb. nonstriatedc. excitabled. striatedarrow_forwardIn sustained, moderate exercise, skeletal muscle is predominantly using ______________ as its energy source. a. amino acids b. glucagon c. fatty acids d. creatine phosphatearrow_forwardAt low intracellular Ca2+ concentration, _________________ the active sites on the thin actin filament. a. troponin blocks b. troponin exposes c. tropomyosin blocks d. tropomyosin exposes e. a and carrow_forward
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