All cells of the human body contain: a. 23 pairs of ...

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All cells of the human body contain:
 
  a. 23 pairs of chromosomes.
  b. 23 chromosomes.
  c. 23 pairs of genes.
  d. 23 genes.

Question 2

Compare the neural circuits that control male and female sexual behavior.
 
  What will be an ideal response?

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Answer to Question 1

Answer: A

Answer to Question 2

Answer: The medial preoptic area is important for male sexual behavior (approach, intromission, and ejaculation). Circuits within the spinal cord mediate male sexual reflexes of erection and ejaculation. Electrical stimulation of the MPA elicits sexual behavior, whereas damage to the MPA impairs male sexual behavior. The MPA receives input from the vomeronasal organ and projects to spinal cord motor neurons that control copulation. In contrast, the ventromedial hypothalamus receives input from the vomeronasal organ in the female rat and this key structure sends outputs to the PAG. Damage to the VMH or to the PAG will disrupt lordosis.