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
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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.
Which blood type is called the universal donor?
A) A B) B C) AB D) O
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.
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.