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2007-05-02 08:09:55 · 6 answers · asked by M?r?? P 5 in Science & Mathematics Biology

6 answers

There seems to be a logical explanation about why women have nipples - for babies. But why do men's bodies retain what appears to be redundant body parts? The Darwinian natural selection process would seem to dictate that male nipples really should not be there. So what's the deal? Why do men have nipples?

The answer is that as embryos men and women have similar tissues and body parts. If anything the embryo follows a 'female template'. That is why nipples are present in both sexes. It is the effect of the genes, the Y chromosome and the hormone testosterone that brings about the changes and masculinises the embryo. Testosterone promotes the growth of the penis and testicles. Because nipples are there before this process begins the nipples stay!

Nipples and breast tissue have no function as such except for perhaps protecting the heart and lungs from injury.

Male Breasts Can Produce Milk and Get Breast Cancer
A certain level of the female hormone estrogen is present in all men.

If, as a result of disease or a condition affecting hormones, breast tissue in men can grow (gynecomastia- abnormal enlargement of breasts,) and men can produce milk.
Gynacomastia is more commonly seen in adolescence, a period in development when hormones fluctuate a lot. It is also seen in some men with liver disease and sometimes in alcoholics.

Men can get breast cancer as well as women.

2007-05-02 08:14:47 · answer #1 · answered by Mark S, JPAA 7 · 3 0

The best explanation I've heard is that both males and females start out with the same basic body type and it's the hormones that influence whether you end up with a male or female.

To borrow a car analogy and explain the nipples in particular, think of a car with the option to have air conditioning as the basic body type. Getting the a/c installed is like a female body developing breasts. Leaving the a/c out is like the male body with nipples but not fully developed breasts ... the a/c isn't installed, but you can still see the place in the dashboard where it would have gone.

2007-05-02 15:20:11 · answer #2 · answered by Navigator 7 · 3 0

Everybody has nipples; they are a part of our genetic structure - male or female. When girls go through puberty, their bodies produce hormones which cause their breasts to grow. Boys' bodies produce different hormones, but they still have nipples.

2007-05-02 15:15:34 · answer #3 · answered by computerguy103 6 · 2 0

type in MEN and NIPPLES in the search box above.
you'll get 854 similar questions and their answers.

2007-05-02 15:15:25 · answer #4 · answered by Anonymous · 2 0

This question get asked all of the time. Type in some words from your question into the search function, and see what happens.

2007-05-02 15:19:26 · answer #5 · answered by Randy G 7 · 1 0

now there are many scientific, medical and specialist opinions behind this question...but it's my personally belief that we have them because it's just the way God intended.

2007-05-02 16:06:42 · answer #6 · answered by Anonymous · 0 1

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