The respiratory mucosa helps protect the respiratory system by:
a. trapping bacteria
b. moving contaminated mucus towards the pharynx
c. having ciliated epithelium beat in only one direction
d. all of the above
d. all of the above
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The two items that form protective layers around the secondary oocyte are the zona pellucida and
A. transverse membrane. B. acrosome. C. primary oocyte. D. corona radiata. E. polar body.
The primary motor area of the brain is in the
A) precentral gyrus of the frontal lobe. B) postcentral gyrus of the parietal lobe. C) lateral part of the occipital lobe. D) posterior sulcus of the temporal lobe.
The enzyme ________ resides in the synaptic cleft and breaks down molecules of Ach.
Fill in the blank(s) with the appropriate word(s).
Smooth muscle
A. has a resting membrane potential that is more negative than skeletal muscle fibers. B. responds in an all-or-none fashion. C. has fast waves of depolarization. D. depolarizes when both Na+ and Ca2+ diffuse into the cell. E. has fast waves of repolarization.