Comparing Rates of Cell Division Different cell types divide at different rates.

Cell Type Approximate Lifespan

Skin cell 2-3 Weeks

Red blood cell 4 months

Liver 10-18 months

Intestine - internal lining 4-5 days

Intestine- muscle and other tissues 16 years

All cells in your body undergo cell division, but the rate at which they divide is linked to your body’s need for that type of cell. In human cells, the S, G2, and M phases together usually take about 12 hours. The length of the G1 phase differs the most from cell type to cell type. The rate of cell division is rather in embryos and children than in adults. Children have a shorter cell cycle, and many of their organs are still developing. But the rate of cell division also varies within different tissues of the adult body. For example, the internal lining of the digestive tract receives a lot of wear and tear. The cells of the lining also encounter toxins that enter the body through the digestive tract. As a result, the cells that line the stomach and intestines are replaced every few days. In contrast, cells that make up the rest of the intestine (mainly smooth muscle) and many of the internal organs, such as lungs, kidneys, and liver, divide only occasionally, in response to cell injury or death.

There are about 25 trillion red blood cells in the human body. Red blood cells that are worn out and die are replaced by new cells produced in the bone marrow and stored in the spleen. Use the data from the table to calculate the number of red blood cells the human body loses due to natural cell death each second. Assume there are 30 days in 1 month. Convert your answer to decimal form and round to the nearest tenths place ( e. g., 1,500,000 = 1.5 million).

Calculate how many seconds a red blood cell lives (how many seconds in a month)?

How many red blood cells does the human body lose due to natural cell death each second?

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