Ependymal cells ________.
A) are a type of neuron
B) are a type of macrophage
C) are the most numerous of the neuroglia
D) help to circulate the cerebrospinal fluid
D) help to circulate the cerebrospinal fluid
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All sensory impulse except the sense of smell pass through this structure on their way to the cerebrum:
a. thalamus b. cerebellum c. intermediate mass d. red nucleus
Which of the following are ways in which binding of an intercellular chemical messenger with a cell's receptor can bring about a cellular response?
A. opening or closing of specific ionic channels in the plasma membrane B. activation of an intracellular second-messenger system C. promoting or inhibiting the transcription of genes that code for the synthesis of cellular proteins D. activating or inhibiting intracellular enzymes E. All of the choices are correct.
The mechanism of gustatory reception seems to parallel that of
A) light receptors. B) mechanoreceptors. C) olfactory receptors. D) nociceptors. E) baroreceptors.
Which of the following statements concerning sebaceous glands is false?
A. Most sebaceous glands are connected by a duct to the upper portion of the hair follicle. B. Sebaceous glands are an example of apocrine glands. C. Secretions from sebaceous glands provide protection against bacteria. D. Sebaceous secretions are lipid soluble. E. Secretions from sebaceous glands oil the hair and skin.