Anatomy and Physiology

A young man is in an accident that crushes his spinal cord at the neck and leaves him paralyzed from the neck down. The man asks his physician if he will be able to have erections and father any children. What should the doctor tell him? Explain your answer.
A breast-feeding woman leaves her baby at home and meets a friend for dinner. Two tables over, a baby is crying and the woman notices her shirt becomes wet from leaking milk. Explain the physiological link between hearing that sound and the ejection of milk.
A woman has a mutation that causes the zona pellucida to be tough and not disintegrate after the egg was fertilized. How would this affect her fertility? Explain.