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If you could remove all of your skin, it would weigh up to 5 pounds.

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

An example of a homeostatically controlled variable: blood levels of glucose in a human. An example of a homeostatically controlled variable: blood levels of glucose in a human.
(A) The levels of the spinal cord and spinal nerves. (B) Photograph of the spinal cord as it descend (A) The levels of the spinal cord and spinal nerves. (B) Photograph of the spinal cord as it descend
A genetic bottleneck reduces a population temporarily to very low levels, removing much of its genet A genetic bottleneck reduces a population temporarily to very low levels, removing much of its genet
Health Risks Associated with Levels of Body Fat Health Risks Associated with Levels of Body Fat
Levels of protein structure: Primary structure Levels of protein structure: Primary structure
Sam and Jen had a tax liability of 5,115 last year. They were entitled to tax credits of 112 ... Sam and Jen had a tax liability of 5,115 last year. They were entitled to tax credits of 112 ...
Video: Fetal Development of the Cardiovascular System

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