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

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Cnidarians have specialized stinging cells called cnidocytes Cnidarians have specialized stinging cells called cnidocytes
Cells involved in specific immunity in vertebrates. Cells involved in specific immunity in vertebrates.
Goblet cells that line the intestine Goblet cells that line the intestine
Hormones Regulate Blood Glucose Hormones Regulate Blood Glucose
Surfaces of Epithelial Cells and the Basement Membrane Surfaces of Epithelial Cells and the Basement Membrane
Cancer cells can move to new locations in the body, a process called metastasis Cancer cells can move to new locations in the body, a process called metastasis
Video: Interspecific Competition Relationship - Competitive & Niche Differentiation

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