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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

DNA molecules replicate to form identical chromatids DNA molecules replicate to form identical chromatids
Malpresentation of fraternal twins. Malpresentation of fraternal twins.
Identical twins share 100 percent of their segregating genes. Identical twins share 100 percent of their segregating genes.
Identical Twin Identical Twin
Older mothers more often deliver multiples—twins, triplets, or quads Older mothers more often deliver multiples—twins, triplets, or quads
Concordance Values in Monozygotic and Dizygotic Twins Concordance Values in Monozygotic and Dizygotic Twins
Video: Hydrogen bonds - role in the body

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