2006-11-27 15:40:55 · 11 answers · asked by Mubby 1 in Health ➔ Men's Health
Men and women are mammals (from the Latin mamma breast) a species that have breasts and feeds its young with milk. The human embryo has tissue that will evolve into breasts. Both male and female babies are born with nipples and ducts intact. It is the presence of genes that direct hormones to differentiate the breast tissue. The Y chromosome stimulates hormones such as testosterone to form male features.
Insufficient or defective testosterone, poor tissue responsiveness, or an unbalance of other hormones like Estrogen and Prolactin can cause female like breasts even in men (Gynecomastia). At birth, the small amount of the mother's estrogen in the baby can result in small breasts that usually resolve. There can be an inbalance of hormones during male puberty that can result in temporary breast growth, which for most resolves. There are many medical problems and drugs that can cause male breast growth.
2006-11-27 15:44:09 · answer #1 · answered by Lachelle 3 · 0⤊ 2⤋
Because when fetuses are developing, the nipples develop even before the sex is determined. So.. The fetus gets nipples, and then the genes say whether its a girl or a boy. If its a girl... it gets all the girl stuff.. if its a boy.. it gets all the boy stuff. but either way, they already have nipples! Scientists dont know why the nipples develop at this stage though.
2006-11-27 23:53:29 · answer #2 · answered by Snowboard 2 · 0⤊ 1⤋
Everyone starts out as a female. ALL of the ovum (eggs) that a female has in her ovaries are Y's ... aka female ... and therefore, have "pre-programmed" nipples ... so to speak. The sex of the baby is determined by the male ... depending on weather he fertilizes the egg with his Y or X sperm. Regardless which sperm fertilizes the ovum, male(X) or female(Y) ... the nipples stay.
2006-11-27 23:59:03 · answer #3 · answered by ♥Carol♥ 7 · 0⤊ 0⤋
Because god has a sense of humor. Male horses don't have nipples.
2006-11-27 23:42:15 · answer #4 · answered by Maitreyi 2 · 0⤊ 0⤋
to complete the male body features
2006-11-28 00:15:10 · answer #5 · answered by Answerer 4 · 0⤊ 0⤋
Because in a few years their gonna be able to have babies. Good luck guys.
2006-11-28 13:34:09 · answer #6 · answered by ♥ME♥ 6 · 0⤊ 0⤋
because we all start out the same in utero. It isn't until 2nd trimester that sexual organs are distinguishable.
2006-11-27 23:46:23 · answer #7 · answered by kirsten j 4 · 1⤊ 1⤋
your question should be why do some men have man-boobs
2006-11-28 01:55:44 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Well you do realize men have breast tissue don't you? basically men have really small breasts. My father died of breast cancer five years ago.
2006-11-27 23:53:10 · answer #9 · answered by 2010 2 · 0⤊ 1⤋
Just in case you want to change your sex.
2006-11-27 23:46:27 · answer #10 · answered by Subhasis G 4 · 0⤊ 1⤋