The scrotum changes size to maintain the right temperature. When the body is cold, the scrotum shrinks and becomes tighter to hold in body heat. When it's warm, it gets larger and floppier to get rid of extra heat. This happens without a guy ever having to think about it. The brain and the nervous system give the scrotum the cue to change size. The accessory glands , including the seminal vesicles and the prostate gland , provide fluids that lubricate the duct system and nourish the sperm.
The urethra is the channel that carries the sperm in fluid called semen to the outside of the body through the penis. The urethra is also part of the urinary system because it is also the channel through which pee passes as it leaves the bladder and exits the body. The penis is actually made up of two parts: the shaft and the glans.
The shaft is the main part of the penis and the glans is the tip sometimes called the head. At the end of the glans is a small slit or opening, which is where semen and urine exit the body through the urethra yoo-REE-thruh. The inside of the penis is made of a spongy tissue that can expand and contract.
All boys are born with a foreskin , a fold of skin at the end of the penis covering the glans. Some boys are circumcised, which means that a doctor or clergy member cuts away the foreskin. Circumcision is usually done during a baby boy's first few days of life.
It's not medically necessary, but parents who choose to have their sons circumcised often do so based on religious beliefs, concerns about hygiene, or cultural or social reasons. Boys who have circumcised penises and those who don't are no different: All penises work and feel the same, regardless of whether the foreskin has been removed. When a baby boy is born, he has all the parts of his reproductive system in place, but it isn't until puberty that he is able to reproduce. Sperm production in the testes takes place in coiled structures called seminiferous tubules.
Finally, the semen is ejaculated from the penis through the urethra. Related MedlinePlus Health Topics. Male Infertility. Browse the Encyclopedia. Each was easily explained, right? Or maybe it was just that you wanted that awkward conversation to end? Whatever the case, you thought you had it all figured out. In short: Yes, even if sperm and semen come out of the vagina, you may still find yourself pregnant.
Want more information? Simply put, semen is the liquid that comes out of the penis , and sperm are the cells found in semen that are responsible for fertilizing egg cells in a female. When a male is aroused, sperm mixes with bodily secretions to make semen.
You can think of sperm as the chia seeds in chia seed pudding! In addition to sperm cells, semen includes a number of bodily secretions to help those sperm cells survive to reach the egg cell.
These include prostatic fluid for neutralizing the acidity of the vagina , seminal fluid to help nourish the sperm , and bulbourethral fluid to lubricate the penis. Additionally, semen includes many nutrients. According to a review of studies , semen includes protein, vitamin C, and a lot of zinc. It also contains fructose, sodium, cholesterol, fat, and traces of vitamin B Because such a small amount of semen is ejaculated during sex, any effect on your nutritional intake will likely be minimal.
However, if a sperm cell fertilizes an egg cell, the effect on your life may be big! During sex, the semen is deposited in the vagina, usually close to the cervix , depending on the position.
Some of the sperm immediately begin swimming to the egg, while the remainder and other liquids in semen simply exit through the opening of the vagina. Alcohol: Responsible drinking. Avoiding stress over the festive season. Hot on Parenthub. Fathers to be: What to pack for hospital. DIY baby hand and feet moulds.
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