Which of the following correctly describes myoglobin's special function in muscle tissue?
A. breaks down glycogen
B. synthesizes ATP
C. acts as a reservoir for oxygen
D. produces action potentials
E. stores glucose
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Question 2) Which of the following statements concerning fast-twitch muscle fibers is true?
A. They split ATP rapidly.
B. They have large deposits of myoglobin.
C. They are well adapted to aerobic metabolism.
D. They have a well-developed blood supply.
E. They have many mitochondria.
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Question 3) Consider the following four phrases and select the one that does not belong with the others.
A. anaerobic metabolism
B. lactic acid production
C. fast twitch fibers
D. fuels runner in a marathon
E. muscle fibers split ATP rapidly
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Question 4) What is an oxygen deficit?
A. a protein found along the groove of the F-actin double helix
B. a T tubule and two adjacent terminal cisternae
C. the combination of myosin heads with active sites on actin molecules
D. the movement of myosin head while attached to actin myofilament
E. after exercise, the oxygen taken in that exceeds the oxygen required for resting metabolism
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Question 5) What is a triad?
A. a protein found along the groove of the F-actin double helix
B. a T tubule and two adjacent terminal cisternae
C. the combination of myosin heads with active sites on actin molecules
D. the movement of myosin head while attached to actin myofilament
E. after exercise, the oxygen taken in that exceeds the oxygen required for resting metabolism
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Question 6) What is a cross-bridge?
A. a protein found along the groove of the F-actin double helix
B. a T tubule and two adjacent terminal cisternae
C. the combination of myosin heads with active sites on actin molecules
D. the movement of myosin head while attached to actin myofilament
E. after exercise, the oxygen taken in that exceeds the oxygen required for resting metabolism
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Question 7) Callie is a world class marathon runner. Which of the descriptions about her dominant type of skeletal muscle is FALSE?
A. They split ATP slowly.
B. They have large deposits of myoglobin.
C. They are well adapted to anaerobic activity.
D. They have a well developed blood supply.
E. They have low glycogen stores.
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Question 8) What is tropomyosin?
A. a protein found along the groove of the F-actin double helix
B. a T tubule and two adjacent terminal cisternae
C. the combination of myosin heads with active sites on actin molecules
D. the movement of myosin head while attached to actin myofilament
E. after exercise, the oxygen taken in that exceeds the oxygen required for resting metabolism
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Question 9) What is the power stroke?
A. a protein found along the groove of the F-actin double helix
B. a T tubule and two adjacent terminal cisternae
C. the combination of myosin heads with active sites on actin molecules
D. the movement of myosin head while attached to actin myofilament
E. after exercise, the oxygen taken in that exceeds the oxygen required for resting metabolism
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Question 10) When skeletal muscle is producing carbon dioxide and water while making ATP, which chemical processes could be active at this time?
A. anaerobic respiration
B. aerobic respiration
C. both anaerobic and aerobic respiration
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