female has 1–2 million oocytes when she is born.
umber decreases during development,
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
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