karvatüübile

Karvatüübile refers to the hair follicle, the structure within the skin from which a hair grows. These complex microscopic organs are responsible for the continuous cycle of hair growth, shedding, and regeneration. Each hair follicle contains a hair bulb, which is the actively growing part of the hair. The hair bulb is nourished by a dermal papilla, a small cone of connective tissue containing blood vessels that provide essential nutrients.

Surrounding the hair bulb is the matrix, a layer of rapidly dividing cells that produce the hair shaft. The hair shaft itself is composed primarily of keratin, a tough, fibrous protein. As the cells in the matrix divide and push upwards, they keratinize and die, forming the visible hair strand that emerges from the skin's surface.

The hair follicle is also associated with a sebaceous gland, which produces sebum, an oily substance that lubricates the hair and skin. Additionally, a small muscle called the arrector pili is attached to the follicle. Contraction of this muscle causes the hair to stand on end, a phenomenon known as goosebumps. The activity of the hair follicle is influenced by various factors, including hormones, genetics, and environmental stimuli, and variations in its function can lead to conditions such as hair loss or excessive hair growth.