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Vas deferens
Vas deferens One of two tubes that carry sperm from the testicles to the penis. When a man has a vasectomy, it is the vas deferens that is severed.
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Sperm
A sperm cell, or spermatozoon (pl. spermatozoa) (in Greek: sperm = semen and zoon = alive), is the haploid cell that is the male gamete. It is carried in fluid called semen, and is capable of fertilising an egg cell to form a zygote. A zygote can grow into a new organism, such as a human. Sperm cells contain half of the genetic information needed to create life. Generally, the sex of the offspring is determined by the sperm, through the chromosomal pair "XX" (for a female) or "XY" (for a male).
Penis
The male sex organ, which consists of a head called glans, and the shaft or body. At the tip of the glans is the urethral opening, through which urine and semen leave the body. The shaft or the body of the penis is made of spongy tissue and blood vessels. And it fills with blood an grows in size (becomes erect) during sexual excitement.
Vasectomy
A surgical procedure in which a man's vas deferens is cut, preventing sperm from being ejaculated. While the procedure can sometimes be reversed, is generally considered a permanent form of birth control.
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Vulva
External, visible part of the female genital area.
Vaccine
A preparation, often of living weakened microorganisms, that is introduced into the body to produce immunity to a specific disease by causing the formation of antibodies.
Vaginal birth
The birth of a baby through the vaginal canal, as opposed to cesarean birth through a surgical incision in the abdomen.
Vaginal birth after cesarean
The vaginal birth of a baby after a woman has already had a child by cesarean. While VBACs are increasingly considered a safe option, an estimated one percent of women attempting this will have a uterine rupture and require an emergency cesarean.
Varicella vaccine
The newest vaccine developed for children; the American Academy of Pediatrics recommends giving it between 12 and 14 months. Estimated to be 70 to 90 percent effective - if your child still comes down with chicken pox, it will be a mild case.
Vas deferens
Vasectomy
A surgical procedure in which a man's vas deferens is cut, preventing sperm from being ejaculated. While the procedure can sometimes be reversed, is generally considered a permanent form of birth control.
Vasography
A test done on a man to determine whether his vas deferens is blocked, preventing sperm from being ejaculated.
Vegan
More restrictive than a vegetarian diet, which excludes only meat, a vegan diet excludes dairy products as well. Pregnant women wishing to follow a vegan diet should seek the help of a dietitian to make sure their nutritional needs are met.
Vegetarian
A vegetarian diet excludes meats, such as beef, turkey, and pork, but includes dairy products.
Ventilator
A machine used to help a person breathe. Also called a respirator, a ventilator can assist with breathing or breathe entirely for a patient.
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