Low blood pressure (hypotension) is a risk factor for heart disease.?
Indicate whether the statement is true or false
False
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Why would removal of the thymus compromise humoral immunity?
A. Helper T cells mature in the thymus and are needed to activate B cells and humoral immunity. B. B cells responsible for humoral immunity mature in the thymus. C. Once activated, B cells must travel to the thymus in order to produce antibodies. D. Most mature B cells reside in the thymus, so removing the thymus removes the majority of the body's B cells.
In emphysema,
A) tar from cigarettes blackens alveoli. B) cells in the bronchial lining divide too fast. C) membranes form within alveoli, increasing surface area. D) pressure in alveoli increases and their walls burst, coalescing them and decreasing the surface area for gas exchange.
The transparent portion of the fibrous tunic is the
-pupil. -conjunctiva. -iris. -cornea. -canthus.
On-center ganglion cells _____________ their spike frequency when the center of their receptive field is stimulated by light
a. increase b. decrease c. do not change