Human Body Topics
Many people have heard some version of the saying “it takes X muscles to frown, but only Y muscles to smile,” with X usually being larger than Y, to suggest that it should be easier to smile than frown. The numbers in this saying can vary quite radically, however, and even when one accounts for [...]
A neurotransmitter is a specialized messenger chemical that transfers or sends information from one type of cell to another. Scientists have managed to identify over 100 neurotransmitters in the human brain alone, but evidence suggests we have significantly more than this number. An unfortunate aspect of not being able to identify all neurotransmitter cells is [...]
There are between nine and twenty-one human senses, depending on who you ask, and how they define a sense. It is generally agreed that nine is the minimum. These are touch, taste, smell, sight, hearing, thermoception, nociception, equilibrioception, and proprioception. Hunger and thirst are also sometimes included. Generally, for something to qualify as a sense [...]
Since the advent of nuclear energy and space travel, humans have been exposed to radiation more frequently and it has become a hot topic. There are various different things that we call “radiation”, but the type that damages humans is composed of either electromagnetic waves or atomic nuclei, which do their damage through ionization – [...]
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he ovulation period lasts 24 to 48 hours. That seems like a very narrow window to get pregnant, but it’s important to remember that sperm can live 3 to 5 days in the woman’s body. So while your chances of getting pregnant are much better if you have sexual intercourse in the day or two [...]
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Unlike men, who produce new sperm daily throughout most of their lifetime, women are born with all their eggs in one – okay, two baskets (ovaries). To be more precise, a woman is born with about one to two million immature eggs, or follicles, in her ovaries. Throughout her life, the vast majority of follicles [...]
Peanut allergies are the body’s overreaction to certain proteins found in peanuts. The immune system’s response to these allergens is to trigger an antibody, which then triggers other chemicals. One of the scariest results of these chemicals is the chance for anaphylaxis, which is a potentially fatal condition in which sufferers have trouble breathing because [...]
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Humans have 24 ribs (12 pairs). The first seven sets of ribs, known as “true ribs”, are directly attached to the sternum through the costal cartilage. Rib 1 is unique and harder to distinguish from other ribs. It is a short, flat, C-shaped bone. The vertebral attachment can be found just below the neck and [...]
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Sex—and smooching and snuggling and everything else on the spectrum—is great for your relationship and happiness, but intimate time with your sweetie is also terrific for your physical health. Not only does that “loving feeling” get your heart rate up, it can burn some serious calories, too! Remember how, when you were first dating, you’d [...]
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