Multiple choice

Which of the following statements is false regarding the changes in penis during copulation?

  1. Although the penis is completely refractory to stimulation during the primary stage of the resolution phase, this stage is relatively longer.

  2. Contractions in the urethra, bulbocavernosus and ischiocavernosus muscles promotes ejaculation.

  3. Men cannot usually achieve an erection after spinal cord injuries.

  4. Muscular contractions in the prostate, seminal vesicles and vas deferens drives emission.

  5. During secondary involution, the penis progressively regains responsiveness.
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A Correct answer
Explanation

The resolution phase of the male sexual cycle is divided into two parts. During the primary stage of involution, penile detumescence occurs; the penis reduces to 50% of its fully erect state and remains completely refractory to stimulation. This stage is relatively short.

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