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Did you know?

Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

Organization of the vertebrate nervous system. Organization of the vertebrate nervous system.
Biology Is Studied at Many Levels of Organization (Part 2) Biology Is Studied at Many Levels of Organization (Part 2)
The spongy bone in the top of the femur changes density and organization during growth. The spongy bone in the top of the femur changes density and organization during growth.
Organization of the nervous system. Organization of the nervous system.
Athletes sometimes take supplements, such as creatine or caffeine, to enhance their athletic perform Athletes sometimes take supplements, such as creatine or caffeine, to enhance their athletic perform
biological organization biological organization
Video: Atrophy

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