Whatever the length, ovulation will happen about days before the start of the next period. The average length of the cycle is around 28 days, but it can be as short as 21 or as long as 40. 4 What is a menstrual cycle? The menstrual cycle is from the FIRST DAY OF A PERIOD until the DAY BEFORE THE NEXT PERIOD STARTS. Sperm are damaged by heat, so the balls are carried outside the body in a soft bag of skin (the scrotum) to keep cool. Sperm are made continuously in great numbers inside each testicle and stored in the epididymis (a small tube at either side of each testicle) until they are fully mature and ready to be ejaculated. clitoris urethra outer lips inner lips vagina anus scrotum penis genitals A man has two testicles (balls). 2 How does it all work? How does it all work? reproductive organs bladder seminal vesicle prostate gland sperm duct epididymis testicle urethra fallopian tube uterus (womb) fallopian tube bladder seminal vesicle ovary cervix vagina ovary womb lining (endometrium) genitals prostate gland sperm duct epididymis urethra testicle genitals A woman has two ovaries, one on each side of her uterus (womb).
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