Packages DNA;

2 of each choromosome (1 from each parent).

Each chromosome codes for certain parts of the body.

Males deliver sperm to the egg;

Females produce eggs;

Both carry 23 SINGLE chromosomes.

Once sperm and egg fuse, choromosomes  pair up.

Sperm Production

Sperm produced in seminiferous tubules;

Testosterone produced in interstitial cells;

Sperm moves to epididymis;

Sperm moves to vas deferens where sperm is mixed with seminal fluid.

Sperm makes up only 10% of the seminal fluid.

Secretes 13-33% of the sperm.

Secretion activates sperm

Secretes 60% of the seminal fluid;

contains fructose, citric acid & amino acids

Vasectomy

Permanent birth control;

Vas defens is cut so sperm doesn't enter seminal fluid.

Egg Production

Ovary produces oocytes (eggs)

Oocytes mature in 10-14 days

Mature oocytes (ovum) bursts and moves from ovary to oviduct

If fertilized, it enters the uterus and implants into uterus lining.

Uterus is lined with endometiral tissue.

Tissue thickens in response to hormones and sheds during menstruation.