BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 32, Problem 9SA
Summary Introduction
Introduction:
A mature skeletal muscle fiber has thousands of threadlike proteins which are called myofibrils. These myofibrils are arranged as a contractile unit to form sarcomere. The sarcomere has a thick filament, which consists of motor protein myosin, and the thin filament of sarcomere has actin as a motor protein.
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Dark areas called _____ made of proteins are where actin filaments attach within a myofibril. A. Z lines B. A bands C.T tubules D. I bands
According to the sliding filament model, binding sites on actin open when ________. a. creatine phosphate levels rise b. ATP levels rise c. acetylcholine levels rise d. calcium ion levels rise
At 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 c
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- 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 reticulumarrow_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_forwardThe correct order for the smallest to the largest unit oforganization in muscle tissue is ________.a. fascicle, filament, muscle fiber, myofibrilb. filament, myofibril, muscle fiber, fasciclec. muscle fiber, fascicle, filament, myofibrild. myofibril, muscle fiber, filament, fasciclearrow_forward
- The Sarcomere 2 Thin filaments are often named for which protein? a. actin b. myosin c. troponin d. tropomyosinarrow_forwardThe cells of muscles, myocytes, develop from________.a. myoblastsb. endodermc. fibrocytesd. chondrocytesarrow_forwardWhich of the following is the site of calcium ion storage within muscles? a. T tubules b. sarcoplasmic reticulum c. actin filaments d. myosin filamentsarrow_forward
- A thick filament is made up of Select one: a. myosin and regulatory filaments b. actin and regulatory proteins C. actin and myosin d. myosinarrow_forwardMark the following statements as true for smooth muscle tissue, cardiac muscle tissue, and/or skeletal muscle tissue. a. _____ Actin attaches to dense bodies. b. _____ Cells are joined by intercalated discs. c. _____ The thick and thin filaments are arranged into sarcomeres. d. _____ The thick filaments contain myosin heads along their entire length. e. _____ The cells depolarize and contract as a unit. f. _____ Calcium ions binding to troponin is the initiating event of contraction. g. _____ Calcium ions binding to calmodulin is the initiating event of contraction. h. _____ The sarcolemma has a distinct motor end plate.arrow_forwardD2arrow_forward
- During contraction, the bulk of calcium comes from: A. sarcomere B. sarcoplasm C. sarcoplasmic reticulum D. sarcolemma Coming off of the M line are _________ fibers and extending off of the Z line are __________ fibers. A. troponin; tropomyosin B. actin; myosin C. myosin; actin D. tropomyosin; actin E. myosin; tropomyosinarrow_forwardThe sliding filament mechanism describes the process during which: a. actin and myosin slide relative to each other b. sarcomeres slide relative to each other c. troponin and tropomyosin slide relative to each other d. muscle fibers slide past each otherarrow_forwardWhat structure in skeletal muscle cells functions in calcium storage? a.myofibrillar network b.sarcoplasmic reticulum c.intermediate filament network d.mitochondriaarrow_forward
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