The functional unit of muscle contraction is
A) the myosin cross-bridge.
B) the muscle fiber.
C) the muscle.
D) the sarcomere.
D
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Hormones produced in the anterior pituitary are
a. made in distinct populations of cells b. either tropic or nontropic c. secreted into the blood d. released in response to certain hormones e. all of the above
What does the basilar artery branch into next?
A) Internal carotid artery B) Vertebral arteries C) Anterior communicating artery D) Cerebral arterial circle
The bilirubin entering the liver comes from the ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements regarding the sliding filament model is false?
A. The A band remains constant in length. B. Actin and myosin do not shorten during contraction. C. The sarcomere shortens. D. Both actin and myosin myofilaments shorten during contraction. E. The I band and H zones become narrower during contraction.