What is the function of the ciliary muscles?
A. They open the upper eyelid.
B. They abduct the eye.
C. They change pupil diameter when lighting conditions change.
D. They change the shape of the lens to accommodate near or far vision.
E. They close the upper eyelid.
Answer: D
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What research questions might be asked by anatomists, and what questions might be asked by physiologists, to determine if pheromones are important to humans?
The facial part of an adult skull makes up about one-half of the skull; the facial part of a fetal skull at the time of birth makes up about ________ of the skull.
A. one-half B. one-eighth C. one-fourth D. one-third E. one-twentieth
Which are functions of melanin? Choose all that apply.
A. It is responsible for most of skin color. B. It acts as a vitamin, helping with calcium absorption. C. It acts as a shield, absorbing UV rays. D. It is secreted onto the surface of the skin.
An electroencephalogram is a record of action potential activity in the cerebral cortex
Indicate whether the statement is true or false