Which of the following is a depressor of the scapula?
a. Upper trapezius.
b. Upper pectoralis major.
c. Lower trapezius.
d. Serratus anterior.
Answer: c. Lower trapezius.
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A cell or organ that responds to commands of the control center in negative feedback is termed a(n)
A) receptor. B) thermoregulator. C) control center (integration center). D) effector. E) stimulus.
In general, for a vessel of a given size, a typical artery ________ compared to a typical vein.
A) is more elastic B) has less smooth muscle in its tunica media C) has no endothelium D) has thinner walls E) has a larger lumen
____________________ conduction involves the spread of the action potential along every patch of membrane down the length of the axon
Fill in the blank(s) with correct word
A megakaryoblast will develop into
a) a red blood cell. b) a white blood cell. c) a platelet. d) either a white blood cell or a platelet. e) none of these choices.