When men become sexually aroused, hormones, muscles, nerves, and blood vessels all work with one another to create an erection. Nerve signals, sent from the brain to the penis, stimulate muscles to relax. This, in turn, allows blood to flow…
Male infertility is when a man has a poor chance of making his female partner pregnant. It usually depends on the quality of his sperm cells. Sperm count refers to the average number of sperm present in one sample of…
Good sleep is necessary for good health. Sleep health is increasingly recognized as important for physical and mental health by both the medical profession and the general public, and there is great interest in how to avoid and treat sleep…
