Module 2 page 2 - GRLContent

Tags

Top Highlights

• female has 1–2 million oocytes when she is born.

• umber decreases during development,

• single ejaculation

• we need sperm from a male and an ovum

• from a female

• Sperm are not present when males are born; they are only produced after pubertal development.

• hen sperm are produced daily in the testicles, specifically in the seminiferous tubules.

• called into action by follicle-stimulating hormone (FSH), which is released by the pituitary gland and by testosterone which is generated locally

• perm move into the epididymis to mature and to be stored.

• requires 68 days

• 200 million per day

• may contain between 39 and 928 million sperm

• sperm are forced into ejaculatory ducts and then the urethral bulb by rhythmic muscular contractions of the vas deferens, the prostate gland, and the seminal vesicle

• Contractions of the urethra and at the base of the penis join the other contractions to force semen out of the penis.

• When sperm enter a female, they swim through the vagina, cervix, corpus of the uterus, and into the fallopian tubes

• one fertilizes the ovum in the fallopian tubes

• between 12 and 18 hours of ovulation.

• sperm can be waiting for the egg a few days before ovulation and are able to live in the uterus and fallopian tubes for 1–6 day

• by puberty a female has approximately 400,000 oocytes

• During each menstrual cycle, 30–40 oocytes begin to develop as follicles within the ovary ripen and compete to produce the most estrogen