Impotence occurs when

A. sperm cell production decreases.
B. an erection cannot be achieved or maintained.
C. semen moves out of the urethra.
D. the erectile tissues of the penis fill with blood.
E. semen accumulates in the urethra.


Answer: B

Anatomy & Physiology

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The presence of more oxytocin receptors in the uterus leads to weak, irregular contractions known as ________

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