In which stratum of the epidermis does mitosis produces new cells?
The stratum basale is a single layer of cells primarily made of basal cells. A basal cell is a cuboidal-shaped stem cell that is a precursor of the keratinocytes of the epidermis. All of the keratinocytes are produced from this single layer of cells, which are constantly going through mitosis to produce new cells.
Which tissue is known for its high 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.
Does mitosis occur in stratum Spinosum?
This image shows the stratum basale and stratum spinosum. The cells of the stratum basale are cuboidal and undergo mitosis to give rise to all of the cells in the layers above. … The keratinocytes in the stratum spinosum have a prickly appearance.
Which layer of the epidermis is responsible for cell division and replacement of old cells?
Explanation: The epidermis is composed of three tissue layers. The base layer and most inferior is the Germinative Layer which is responsible for the production of new epidermal cells by mitosis.
Where are new cells formed in the epidermis?
Which layer of the epidermis produces new epidermal cells? The stratum basale produces new epidermal cells.
Does epithelial tissue have a high mitotic rate?
6. Has a high mitotic rate, therefore a high capacity for renewal If you cut yourself cutting a bagel they will be replaced by cells doing mitosis.
What is high mitotic rate?
The higher the mitotic count, the more likely the tumor is to have metastasized (spread). The logic is that the more cells are dividing, the more likely they will invade the blood or lymphatic vessels and thus spread around the body.
What is considered a high mitotic index?
The mitotic thresholds, as suggested by Perry and coworkers,3 were adopted by the WHO as an objective grading criterion: benign (WHO grade I) menin- giomas do not exceed 4 mitoses per 10 HPF, atypical (WHO grade II) meningiomas exhibit an MI of 4 or more and fewer than 20, and anaplastic (WHO grade III) meningiomas …