In order for the penis to become erect, which of the following must occur?
A) Swelling of the penis bone
B) Stiffening of the spermatic cord
C) Accumulation of blood in the spongelike tissues of the three erectile cylinders
D) Activation of the penis muscle fibers must exceed threshold
Question 2
A man wakes up in the morning with an erection. Which of the following would be LEAST likely to be associated with this?
A) He has a full bladder.
B) He has just completed a REM stage of sleep.
C) He has been dreaming about his lover.
D) His lover has been kissing him while he was asleep.