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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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

Gram-positive and Gram-negative bacteria. Gram-positive and Gram-negative bacteria.
Gram-positive and Gram-negative bacteria. Gram-positive and Gram-negative bacteria.
Mutualistic associations between fungi and plant roots: (a) arbuscular mycorrhizal fungus stained so Mutualistic associations between fungi and plant roots: (a) arbuscular mycorrhizal fungus stained so
Machanism of DNA uptake by bacteria Machanism of DNA uptake by bacteria
Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d Pneumonia. This common lung inflammation may be caused by bacteria, viruses, or fungi and is often d
Notice the reddish-brown haze caused by nitrogen oxides that is often over many major cities. Notice the reddish-brown haze caused by nitrogen oxides that is often over many major cities.
Video: Spermatogenesis Animation

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