Why is the biconcavity of the erythrocyte important?
a. It prevents osmolarity changes.
b. It increases the rate of oxygen and carbon dioxide exchange.
c. It provides additional surface area for endocytosis.
d. It enhances the diffusion of oxygen into the erythrocyte for cellular respiration.
e. It inhibits the influx of toxic materials into the cell.
B
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People with REM sleep disorder most likely have:
a. damage in the pons and midbrain. b. damage to areas of the brain that normally produce movements during REM. c. restricted oxygen intake during sleep due to factors associated with obesity. d. abnormally high levels of serotonin in the brain.
The glial cells in the central nervous system that form scar tissue after central nervous system injury are the
A) astrocytes. B) satellite cells. C) oligodendrocytes. D) microglia. E) ependymal cells.
Cytotoxic T-lymphocytes destroy infected cells by
A. increasing the permeability of infected cells and preventing apoptosis. B. decreasing the permeability of infected cells and preventing apoptosis. C. increasing the permeability of infected cells and inducing apoptosis. D. decreasing the permeability of infected cells and inducing apoptosis.
The figure is a process figure of the chemical synapse. What does "D" represent?
A. postsynaptic membrane B. synaptic cleft C. synaptic vesicle D. voltage-gated calcium channel E. presynaptic terminal