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

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Synthesis and major functions of the chief steroid hormones in animals. Synthesis and major functions of the chief steroid hormones in animals.
Hormonal control of the male reproductive hormones. Hormonal control of the male reproductive hormones.
Hormones and Hormone Antagonists Hormones and Hormone Antagonists
The endocrine glands and their hormones. The endocrine glands and their hormones.
Endocrine Gland Hormones and Their Functions Endocrine Gland Hormones and Their Functions
Hormones that act through second messengers involve a three-protein module Hormones that act through second messengers involve a three-protein module
Video: Amniocentesis and CVS Animation

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