Why do stomach cells divide faster than liver cells?
Why do the cells lining the stomach divide more quickly than those in the liver? They undergo more wear and tear. During which of the following stages shown in Figure 5.1 does the cytoplasm of a cell divide? Proteins from outside a cell that stimulate it to divide are called..
Why Do cancerous tissues have a higher mitotic index?
Durations of the cell cycle and mitosis vary in different cell types. An elevated mitotic index indicates more cells are dividing. In cancer cells, the mitotic index may be elevated compared to normal growth of tissues or cellular repair of the site of an injury.
Why would reducing the rate of cell division be helpful in treating cancer?
The ability of chemotherapy to kill cancer cells depends on its ability to halt cell division. Usually, cancer drugs work by damaging the RNA or DNA that tells the cell how to copy itself in division. If the cancer cells are unable to divide, they die.
Why is it important for cells to grow before cell division?
It is important for cells to divide so you can grow and so your cuts heal. It is also important for cells to stop dividing at the right time. If a cell can not stop dividing when it is supposed to stop, this can lead to a disease called cancer. Some cells, like skin cells, are constantly dividing.
Why do cells divide instead of growing larger?
There are two main reasons why cells divide rather than continuing to grow larger and larger: … more demands the cell places on its DNA. If the cell grows too large, it will have trouble moving enough nutrients and wastes across the cell membrane.
Why is mitotic index useful?
The mitotic index (percentage of cells in mitosis at any time) provides a measure of the capacity of cells to divide and of the rate of cell division. It is used to identify the sites of growth within a tissue and to determine which cell types are dividing.
Does normal tissue or cancerous tissue have a higher mitotic index?
Which type of tissue would have a higher mitotic index, normal tissue or cancerous tissue? Cancerous tissue would have a higher mitotic index because the cells are constantly dividing.
Which tissue has the highest rate of mitosis?
Skin cells, hair follicles and the cells lining our intestines (epithelial cells) all have high rates of mitosis as these tissues constantly need to be replaced. In plants growth occurs largely at the shoot and root tips. These cells have much higher rates of mitosis than the rest of the plant.