The retina of the eye responds to light, converting it into electrical impulses. The retina is made up of
A) cartilage.
B) bone.
C) neurons.
D) smooth muscle.
E) simple epithelium.
C
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What is the end result of activating the MAP kinase pathway?
A. a change in gene expression B. phosphorylation of multiple cytosolic proteins C. synthesis of second messenger molecules D. ion flow
____ form in the bone marrow, but ____ mature in the thymus
a. B cells; T cells b. T cells; B cells c. B and T cells; B cells d. B and T cells; T cells
e. B and T cells; B and T cellsThe two principal divisions of the peripheral nervous system are the
a. somatic and autonomic systems. b. sympathetic and parasympathetic systems. c. peripheral and central systems. d. afferent and autonomic systems. e. cranial and skeletal nerves.
Refer to the accompanying figure. The function of the structure labeled as 6 is to:
a. secrete an alkaline fluid that neutralizes the acids of the vagina. b. produce a nutritive fluid for the sperm. c. provide a place for maturation and storage of sperm. d. secrete mucus that lubricates the penis. e. maintain sperm at a low body temperature