Which of the following is true about smooth muscle contraction?
A) Certain smooth muscle cells can actually divide to increase their numbers.
B) Smooth muscle, in contrast to skeletal muscle, cannot synthesize or secrete any connective tissue elements.
C) Smooth muscle cannot stretch as much as skeletal muscle.
D) Smooth muscle has well-developed T tubules at the site of invagination.
A) Certain smooth muscle cells can actually divide to increase their numbers.
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If acetylcholine (ACh) causes inhibition of a postsynaptic neuron, to what type of membrane channel did the ACh bind?
A) mechanically-regulated channel B) voltage-regulated sodium channel C) voltage-regulated calcium channel D) chemically-regulated potassium channel E) chemically-regulated sodium channel
Glands within the lamina propria of the respiratory mucosa secrete
A) hormones. B) saliva. C) mucus. D) sweat. E) acids.
In order to accommodate the large liver,
A. the right kidney is about 2 centimeters inferior to the left kidney. B. the left kidney is about 2 centimeters inferior to the right kidney.
How does a buffer help a solution maintain pH?
A. A buffer releases a base to neutralize an acid. B. A buffer forms both cations and anions to counteract acids. C. A buffer releases acid to maintain proper pH. D. A buffer can act like a base if pH is acidic, and it can act like an acid if pH is basic.