What is the role of ATP in the sliding filament theory?
A. Breaks the link between actin and myosin
B. Energizes the myosin cross-bridge
C. Both energizes the myosin cross-bridge and breaks the link between actin and myosin.
Answer: C
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A runner moving at a velocity of 6 m/s increases the velocity in a 2 s time interval to a rate of 10 m/s. What is the rate of acceleration?
A. 4 m/s2 B. 4 m/s C. 2 m/s2 D. -2 m/s
Atrial systole begins ________.
A. immediately before the P wave B. immediately after the P wave C. immediately after the T wave D. during the Q wave E. during the S-T segment
What respiratory event occurs when intrapulmonary pressure is greater than atmospheric pressure?
A) exhalation B) ventilation C) inhalation D) Movement of air does not occur.
Macrophage colony-stimulating factor stimulates the production of
A. erythrocytes from myeloid stem cells. B. monocytes from monoblasts. C. erythrocyte progenitor cells. D. megakaryocytes and platelets. E. granulocytes from their progenitors.