The ________ principle states that the size and speed of an action potential are independent of the stimulus strength

A) threshold
B) all-or-none
C) graded potential
D) saltatory propagation
E) summation


Answer: B

Anatomy & Physiology

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Which blood type is called the universal donor?

A) A B) B C) AB D) O

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Stretch reflexes:

A. occur only in the legs. B. inhibit antagonistic muscles. C. mediate flexor activation and withdrawal from a painful stimulus. D. are initiated by stimulation of Golgi tendon organs. E. are initiated by stretching of extrafusal muscle fibers.

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The nervous system controls the activity of muscles and glands. Muscles and glands can generate changes and are therefore called

A. afferents. B. effectors. C. stimuli. D. visceral.

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A venous sinus of the vascular system is a

A. network of blood vessels. B. clot on the inner vessel wall. C. blood-filled space between two tissue layers. D. smaller vein or venule.

Anatomy & Physiology