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Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

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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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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

Overview of gas exchange between the environment, blood, and cells. Overview of gas exchange between the environment, blood, and cells.
The cells in blood; A, red blood cells (erythrocytes); B, platelets (thrombocytes); C, white blood c The cells in blood; A, red blood cells (erythrocytes); B, platelets (thrombocytes); C, white blood c
blood vessels blood vessels
Epithelial cells Epithelial cells
The metabolic activity of mammalian cells The metabolic activity of mammalian cells
B Cells: Development of Self-Recognition and Self-Tolerance B Cells: Development of Self-Recognition and Self-Tolerance
Video: Chromosome structural organization/ Mechanisms for chromosome movement Animation

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