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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
The longest a person has survived after a heart transplant is 24 years.
![Pericardial effusion: A, normal pericardial sac; B, pericardial sac with excess fluid possibly causi](https://biology-forums.com/gallery/47/medium_18099_24_10_12_3_03_45.jpeg)
![In some species, dominant females have more surviving offspring that mature earlier indicating an ad](https://biology-forums.com/gallery/47/medium_269691_26_01_15_5_57_41_204522328.jpeg)