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Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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There are more sensory neurons in the tongue than in any other part of the body.

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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Germination of grass seeds involves mobilization of stored reserves Germination of grass seeds involves mobilization of stored reserves
A single crossover inserts F at a specific locus, which then determines the order of gene transfer A single crossover inserts F at a specific locus, which then determines the order of gene transfer
Traits With Single-Gene Dominant–Recessive Inheritance Traits With Single-Gene Dominant–Recessive Inheritance
Consensus sequences around splice sites in vertebrate pre-mRNAs Consensus sequences around splice sites in vertebrate pre-mRNAs
Viral single-strand DNA (circular) Viral single-strand DNA (circular)
Identification of conserved noncoding sequences (CNS) Identification of conserved noncoding sequences (CNS)
Video: Inflammatory response Animation

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