The cellular component that, once activated by the binding of an extracellular messenger to a surface receptor, in turn activates cyclic AMP is
a. phospholipase C.
b. adenylate cyclase.
c. calmodulin.
d. calcium.
e. cyclic guanosine monophosphate.
B
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Elliot thought that his peptic ulcers were caused by his nagging parents, and was surprised when the doctor handed him a prescription for medication to treat
A. a bacterial infection. B. a too high pH. C. excess bile. D. a viral infection.
The effects of a neurotransmitter on the postsynaptic membrane include which of the following?
A) The neurotransmitter floats around in the synaptic cleft. B) Upon stimulation, the membrane releases more neurotransmitter molecules. C) Excitatory or inhibitory responses. D) Neurotransmitter molecules are absorbed by the postsynaptic cell. E) None of the answers are correct.
Clusters of neuron cell bodies in the PNS are called _____
A) ganglia B) nuclei C) axons D) neuromas
A typical adult hematocrit is around
A) 75. B) 85. C) 45. D) 25. E) 65.