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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.

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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

The use of bacteria to make human insulin The use of bacteria to make human insulin
The structure and function of the human testis. The structure and function of the human testis.
Orcinus citoniensis fossil, an extinct species of the same genus, Museo Capellini di Bologna Orcinus citoniensis fossil, an extinct species of the same genus, Museo Capellini di Bologna
View of the bottom surface of the human brain. View of the bottom surface of the human brain.
Our species’ ability to form social bonds and be loyal and cooperative within our “tribe” may ... Our species’ ability to form social bonds and be loyal and cooperative within our “tribe” may ...
Essentials of Human Communication (6th Edition) Essentials of Human Communication (6th Edition)
Video: Role of the respiratory system - effect of altered ventilation rates

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