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Each week on TestTubePlus, we pick one topic and cover it from multiple angles. This week's topic is breasts. Over the next five episodes, hosts Trace Dominguez and Amy Shira Teitel will be diving deep into the science, history, and more of boobs: how they work, why men are so obsessed with them, the importance of understanding breast cancer, breast feeding, and much more. To get things started, Trace and Amy will be covering boob basics: what are breasts for, why we only have two nipples, and the science behind breast size.
The mammary gland is an organ found in all female mammals (in fact, mammals get their name from the word "mammary) that produces milk to feed their young offspring. From a medical standpoint, breasts are just fatty tissues, milk-producing lactating glands (lobules), milk ducts, collagen, and skin. Mammals have bilateral symmetry, which is why they're always in pairs. The number of children in a litter determines how many they have. Humans have one pair while dogs have anywhere between six to ten nipples. Because we stand upright, we can only lift one child at a time.
Why do women have breasts while men have flat chests? It comes down to gender specifics, of sexual dimorphism. Among all other primates, women are the only ones who have full breasts all the time, even when they aren't nursing. Other primate breasts swell while they're nursing. There are a number of theories around why this is; the most popular one being that large breasts serve as a signal of fertility higher probability of reproductive success.
TestTube Plus is built for enthusiastic science fans seeking out comprehensive conversations on the geeky topics they love. Each week, host Trace Dominguez probes deep to unearth the details, latest developments, and opinions on big topics like the ocean, porn, exercise, stereotypes, fear, survival, dreams, space travel, and many more.
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Men Vs. Women: Our Key Physical Differences Explained (LiveScience)
"Sexual dimorphism" is the scientific term for physical differences between males and females of a species. Many extreme examples exist: Peacocks far outclass peahens, for instance, while female anglerfish both outsize and outwit their tiny, rudimentary, parasitic male counterparts."
Breasts are barrier to exercise (University of Portsmouth)
"Nearly one in five women say their breasts stop them from participating in physical activity, new research reveals. The research also found that physical activity levels weren't influenced by breast size, which suggests the breast could be a barrier to exercise for women across all bra sizes."