Overview Rash from poison ivy. Many people develop an itchy rash that causes lines or streaks that look like this. Poison ivy, oak and sumac: Overview Many people get a rash from poison ivy, poison oak, and poison sumac. This rash is caused by an oil found in the plants. This oil is called urushiol (you-ROO-shee-all).
Cells in heart muscle process a lot of energy, so they have a large number of mitochondrion, the part of the cells where energy is made. Like all living things, cells die. The number of cells that an adult male loses per minute is roughly 96 million.
The amount of time it takes for one cell to completely divide in most mammals, including the human body, is about 24 hours. Some cells take more or less time, depending on their purpose; a fly embryo takes only eight minutes to divide, for example, while a human liver cell could take more than a year.