Which of the following statements regarding melanin is true?
A. Men produce more melanin than women.
B. In Addison's disease, less melanin is produced.
C. During pregnancy melanin production is increased.
D. Both melanocytes and keratinocytes produce melanin.
E. Melanin is a white pigment.
C
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Insulin and glucagon are produced by the ________.
A. pancreas B. thymus C. adrenal cortex D. adrenal medulla
Which of the following is true about gustatory receptors?
A) In order for a chemical to be sensed, it must be hydrophobic. B) The receptors generate an action potential in response to chemical stimuli. C) Complete adaptation occurs in about one to five minutes. D) All gustatory receptors have the same threshold for activation.
Where are fibers of adjacent spinal nerves sorted and recombined so that fibers specific to a body part reach that body part in the same nerve?
A) ganglion B) nucleus C) plexus D) reticular formation
If the zygote splits into two separate cells,
A. identical twins result. B. fraternal twins result. C. dizygotic twinning occurs. D. both cells die. E. paternal twins result.