Which of the following statements best describes the structure of the blood-brain barrier that provides its functional characteristics?
a) Processes of astrocytes wrap tightly around capillaries in the brain.
b) Tight junctions tightly seal endothelial cells of capillaries in the brain.
c) Gap junctions tightly seal endothelial cells of capillaries in the brain.
d) Spot desmosomes tightly link capillary endothelial cells together.
e) The basement membrane of capillaries in the brain contains extremely small pores.
b
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Some bone interiors contain hemopoietic tissue, which functions in
A. producing blood cells. B. storing fat. C. breaking down toxins. D. making connective tissue fibers. E. producing hormones.
Presbyopia is characterized by
a. the lack of a cone type. b. pronounced visual difficulty in the early teenage years. c. a reduction in accommodative ability as a result of a loss of lens elasticity. d. retinal damage. e. excessive refractive power in the lens system of the eye.
To be considered an organic molecule a substance must contain ________.
A. carbon and nitrogen B. carbon and hydrogen C. oxygen and hydrogen D. carbon and oxygen
Rapid reduction in sensitivity to a new odor results from rapid adaptation of the olfactory receptors
Indicate whether the statement is true or false