Up-regulation
A. results in a decrease in the number of receptor sites in the target cell.
B. produces an increase in the sensitivity of the target cell to the hormone.
C. is found in target cells that maintain a constant level of receptors.
D. produces insensitivity to the hormone in the target tissue.
E. moves the receptors up on the membrane.
B
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Inhalants cause damage to the respiratory tract, but are not absorbed into the body.
a. true b. false
Depolarization of an axon is a positive feedback mechanism because ________.
A. as more sodium channels open, the membrane potential decreases B. as more sodium diffuses into the axon, the more voltage-gated sodium channels open C. as more potassium channels open, the membrane potential decreases D. as more sodium diffuses into the axon, the more voltage-gated potassium channels open
The neural tunic of the eye
-contains bipolar cells. -contains ganglion cells. -contains the photoreceptor cells. -is the deepest layer of the eyeball. -All of the answers are correct.
Brain capillaries are joined by ____________________ junctions
Fill in the blank(s) with correct word