Final answer:
Azoospermia is the absence of sperm in the semen and can cause male infertility. It can be caused by problems with sperm production or blockage of the male reproductive tract. Risk factors for male infertility include heavy alcohol use, smoking, certain medications, and advancing age.
Step-by-step explanation:
Azoospermia in Sperm
Azoospermia is a medical condition characterized by the absence of sperm in the semen. It can be caused by problems with sperm production or blockage of the male reproductive tract that prevents sperm from being ejaculated. A low sperm count can cause male infertility, as millions of sperm are lost between entry into the vagina and degradation of the zona pellucida. Risk factors for male infertility include heavy alcohol use, smoking, certain medications, and advancing age.