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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
There are 20 feet of blood vessels in each square inch of human skin.
![History of the number of observed sunspots during the last 250 years, which shows the ~11-year solar](https://biology-forums.com/gallery/47/medium_12359_16_06_12_7_11_02.png)
![Eighteen-year-olds were the largest age cohort in the first year of the war in both armies. Soldiers](https://biology-forums.com/gallery/47/medium_376021_22_08_15_1_40_22_223511856.jpeg)