A vaccine contains
A. antihistamines.
B. antibodies.
C. lymphocytes.
D. antigens.
Answer: D
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Activation of which kind of receptor causes heart rate to increase?
A) alpha-one B) beta-one C) muscarinic D) beta-two E) preganglionic
Repair of damaged neurons can be assisted by certain neurotrophic factors secreted by the
A) axon and dendrites. B) Schwann cells only. C) cell body only. D) axon only. E) dendrites only.
Simple reflexes in a worm are integrated within a segment rather than in the brain, because
A) worms do not have brains. B) worms have a neural network within each segment. C) worms have a ganglion at each segment. D) worms do not have a nervous system.
Muscle cells require ATP in order to relax, following a contraction
Indicate whether the statement is true or false