8) What is the function of the sarcoplasmic reticulum in striated, vertbrate mus

Question

8) What is the function of the sarcoplasmic reticulum in striated, vertbrate muscle cells?
a. it stores Na+, which is released when the cell depolarizes, allowing ATP to bind to actin and enable muscle contraction. b. it stores Ca2+ ,which is released when the cell depolarizes, allowing ATP to be released from myosin as ADP, and enable muscle contraction. c. it catalyzes the conversion of myosin to tropomyosin d. it stores Ca2+,which is released when the cell depolarizes, allowing ATP to bind to actin and enable muscle contraction. e. none of the above 8) What is the function of the sarcoplasmic reticulum in striated, vertbrate muscle cells?
a. it stores Na+, which is released when the cell depolarizes, allowing ATP to bind to actin and enable muscle contraction. b. it stores Ca2+ ,which is released when the cell depolarizes, allowing ATP to be released from myosin as ADP, and enable muscle contraction. c. it catalyzes the conversion of myosin to tropomyosin d. it stores Ca2+,which is released when the cell depolarizes, allowing ATP to bind to actin and enable muscle contraction. e. none of the above 8) What is the function of the sarcoplasmic reticulum in striated, vertbrate muscle cells?
a. it stores Na+, which is released when the cell depolarizes, allowing ATP to bind to actin and enable muscle contraction. b. it stores Ca2+ ,which is released when the cell depolarizes, allowing ATP to be released from myosin as ADP, and enable muscle contraction. c. it catalyzes the conversion of myosin to tropomyosin d. it stores Ca2+,which is released when the cell depolarizes, allowing ATP to bind to actin and enable muscle contraction. e. none of the above

Explanation / Answer

The answer is - b. it stores Ca2+, which is released when the cell depolarizes, allowing ATP to be released from myosin as ADP, and enable muscle contraction.

Sarcoplasmic reticulum is the storehouse of Ca2+ ions and is released when the muscle is depolarized. Only when ATP is hydrolyzed to ADP, can myosin bind to actin to form cross-bridge. when ATP is attached to myosin, it detaches itself from actin filaments.

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