Questions tagged [human]

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Does all CO2 from the blood leave the body through the respiratory system?

I know that the primary way that CO2 leaves a healthy human’s body from the blood is by diffusing into the lungs during gas exchange and then being exhaled. Is there any other way in which CO2 from ...
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Why haven't we cured the common cold yet?

Researchers think they’re close to a cure for the common cold, but they first need to solve a complex problem that’s perplexed scientists for decades. Polio, smallpox, hepatitis A and B are all ...
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What is the latest possible point during a pregnancy when a fetus can merge with another fetus?

Background A Chimera is an organism that is composed of two or more zygotes. There are several documented incidences of this happening in humans as shown in the cited link. Since chimeras primarily ...
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What's known on genetic factors that explain behavioral differences between human males and females?

Long story short: women are from Venus and men are from Mars. But how much of the differences arose from evolution and how much of it comes from Venusian and Martian cultural differences? Jokes ...