Hair and nails are made of cells, why don t they die without blood vessels?

Hair nails are actually a layer of cuticle, just like the outermost layer of human **, there are no nerves and blood vessels, so cutting hair nails will not hurt or bleed.

For this nutritional problem, only the bottom layer receives nutrients, specifically the roots of hair and nails, and the keratinocytes that grow out are not allowed to be nourished, and they will naturally degenerate after maturity, just like people will shed their skin.

and twist around the fingers. Swollen nail clubbing may indicate emphysema, tuberculosis, cardiovascular disease, ulcerative colitis, or cirrhosis.

2 Blue crescent: A crescent-shaped white mark at the base of the nail with a blue halo may indicate any of the following conditions: obstruction of blood circulation, heart disease, Raynaud's symptoms, and vasospasm of the fingers and toes, usually due to a previous exposure to freezing.

But sometimes it is also associated with rheumatoid arthritis or the autoimmune disease lupus erythematosus.

The nails are not clear, and the hair is made up of dead cells.

1. Hair is a dead cell, which is an organic matter that grows from the keratinization of the hair roots.

2. The nail is composed of two parts, living cells and dead cells, which grow out and are separated from the capillary network of the finger (the part that has no blood color, is whitish, and can be cut off), and the nail deck is dead cells, and the other parts are living cells.

1. Hair is a dead cell, which is an organic matter that grows from the keratinization of the hair roots.

2. The nail is composed of two parts, living cells and dead cells, which grow out and are separated from the part of the capillary network of the finger (the part that is not bloody, whitish, and can be cut off), and the nail plate is dead cells, and the other parts are living cells.

Hair is dead cells. 1.The main component of hair is keratin, which accounts for about 97%.

Keratin, on the other hand, is made up of amino acids. 2.Oriental hair is coarse and black, hard and heavy, because it contains more carbon and hydrogen particles, so the color is dark.

Western hair is light and soft, and its color is lighter because it contains less hydrocarbon. 3.The keratin that makes up the epidermis of hair is made up of more than 20 amino acids arranged vertically.

4.Structure of the hair: Each hair is composed of the epidermal scales, cortex, and medulla.

The epidermal scale layer is the outermost layer of the hair and usually consists of 2 or 4 layers of scales. The epidermis is usually translucent or colorless, so it allows natural hair color to shine through; The cortex makes up 80% of the hair, and natural pigmentation is caused here, and the natural hair color is due to it; The medullary layer is located in the center of the head and is made up of many small bubbles.

The nail has two parts, living cells and dead cells, which grow out and are separated from the capillary network of the finger (the part that is not bloody, whitish, and can be cut off), and the surface layer of the nail is dead cells; The rest are living cells.

Hair is a living cell that can be regenerated, while nails are a type of human bone that belongs to connective tissue and its main component is keratin.