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Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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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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The human body produces and destroys 15 million blood cells every second.

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The FDA recognizes 118 routes of administration.

Nonverbal communications convey strong, powerful messages that may be negative or positive. Nonverbal communications convey strong, powerful messages that may be negative or positive.
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
Homeostasis and negative feedback as related to control of body temperature. Homeostasis and negative feedback as related to control of body temperature.
Flexor (Withdrawal) Reflex Flexor (Withdrawal) Reflex
Reinforcement Reinforcement
Positive and Negative Reinforcement Positive and Negative Reinforcement
Video: Sickle Cell Anemia

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