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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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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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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

(a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest (a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest
Albatrosses brood young chicks until they are large enough to thermoregulate. Albatrosses brood young chicks until they are large enough to thermoregulate.
Polyps and polyposis. A polyp is a protruding growth from a mucous membrane lining a hollow organ. I Polyps and polyposis. A polyp is a protruding growth from a mucous membrane lining a hollow organ. I
Jet streams and Earth’s heat budget Jet streams and Earth’s heat budget
A Successful Physical Fitness Program Uses FITT Principles A Successful Physical Fitness Program Uses FITT Principles
Video: Component of feedback systems & Communication and regulation of body systems

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