The ____ regulates the amount of light that enters through the diameter of the pupil
a. cornea
b. iris
c. retina
d. sclera
b
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A solution with a pH of 6:
a. is an acid b. is a base c. has 10 times more H+ ions than a solution with a pH of 5 d. both A and C above
The cell type that is specialized to communicate with other cells and control their activities is
A. Epithelial cells B. Muscle cells C. Connective tissue cells D. Nerve cells
The term lymphadenopathy refers to
A) a congenital lack or malformation of lymph nodes. B) a chronic or excessive enlargement of lymph nodes. C) accumulations of lymph in the tissue space. D) the lack of lymphocytes in peripheral circulation. E) increased numbers of circulating lymphocytes.
In a child, a vitamin D deficiency results in ________, whereas a vitamin A deficiency results in ________.
A. rickets; retardation of bone development B. pituitary dwarfism; rickets C. excess calcium absorption; osteomalacia D. soft bones; rickets