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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- 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 risearrow_forwardC Sliding filament model D. Sliding microtubule model filaments. They must form and dissociate repeatedly during contraction. are links between the Filamentous F-actin of thin filaments and myosin heads of thick А. Cross bridges B. Calcium switches C. Contraction cycles ! D. Power strokes 52-Calcium plays a key role during contraction of skeletal muscles. When calcium concentration is low in the intracellular compartment, myosin-binding sites on actin are blocked by intracellularly, Calcium binds to When calcium levels rise causing A. Tropomyosin, Troponin C, Tropomyosin to shift and allowing myosin to bind. B. Tropomyosin, Troponin T, Troponin C C. Troponin I, Troponin C, Troponin T D. Troponin C, Troponin T, F-actin 53-During the contraction of sarcomere, while A. A band gets bigger, H zone becomes smaller. B. Sarcomere does not change in size, H zone gets bigger C. H zone double in size, Z lines become closer D. A band does not change in size, Sarcomere becomes smaller nokanalne g…arrow_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
- 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_forwardburst of Calchu musc res an ldum Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 20. A. skeletal muscle cells require a burst of calcium from the sarcoplasmic reticulum. B. smooth muscle cells require a burst of calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require a burst of calcium from the sarcoplasmic reticulum. D. All of the above are correct. to an ent. response to an ertraceil m-currentarrow_forward
- Which of the following is the site of calcium ion storage within muscles? a. T tubules b. sarcoplasmic reticulum c. actin filaments d. myosin filamentsarrow_forwardA 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_forward
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