Caleb Foster
Hair and nails are made up of a hard protein called keratin, which is produced by the keratinization of cells. Nails grow out of deep folds in the skin of the fingers and toes. As epidermal cells below the nail root move up to the surface of the skin, they increase in number and form thin plates that pile into layers to form the nail. Similarly, hair grows by forming new cells at the base of the root. As cells multiply and make keratin to harden the structure, they are pushed up the follicle and through the skin's surface as a shaft of hair.
| Characteristics | Values |
|---|---|
| Type of cells responsible for hair and nail growth | Keratinocytes |
| Where do nails grow from | Deep folds in the skin of the fingers and toes |
| What is the nail matrix | The active tissue that generates cells |
| What is the nail plate | The hard part of the nail that is visible |
| What is the nail bed | The skin under the nail plate |
| What is the lunula | The whitish, crescent-shaped area at the base of the nail |
| How fast do fingernails grow | About 3 millimeters per month |
| How fast do toenails grow | A little slower than fingernails |
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What You'll Learn
Hair and nails are made of a protein called keratin
Keratin is rich in the amino acid cysteine, which gives it the ability to self-assemble into bundles of fibers. These fibers form tough, insoluble structures that are among the strongest non-mineralized tissues found in nature. The high concentration of cysteine in keratin, ranging from 7 to 20% of total amino acid residues, contributes to the formation of inter-and intra-molecular disulfide bonds, further strengthening the keratin structure.
In the context of hair growth, keratin plays a crucial role. As cells multiply and produce keratin, they are pushed up through the hair follicle and out of the skin's surface as a shaft of hair. This process is known as keratinization, where the hair cells die and form the hard structure of the hair shaft. The hair follicle is the tube-like structure from which the hair grows, and it is within the follicle that keratin proteins self-assemble into fibers to generate hair.
Similarly, nails also grow through the process of keratinization. Nails grow out of deep folds in the skin of the fingers and toes, and they are formed by the accumulation of nail cells, which are composed of keratin. As the nail cells multiply and move upward, they flatten and pile into layers, creating the nail plate, which is the hard part of the nail that is visible.
The presence of keratin in hair and nails is essential for their overall health and strength. Keratin treatments and products, such as shampoos and conditioners, are also available to help strengthen hair and improve its appearance.
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Keratin is produced by the keratinization of dead skin cells
Hair and nails are made of a protein called keratin. Keratin is produced by the keratinization of dead skin cells.
Keratin is a type of protein that is a basic component of hair, skin, and nails. It is produced by cells called keratinocytes, which are the primary type of cell found in the epidermis, the outermost layer of the skin. Keratinocytes make up about 90% of epidermal skin cells and play a crucial role in protecting the body from various environmental factors such as heat, UV radiation, water loss, and pathogenic bacteria, fungi, parasites, and viruses.
Keratinization is the process by which keratinocytes produce keratin and undergo terminal differentiation. As epidermal cells move up to the surface of the skin, they increase in number and flatten out. This process of cell division and migration is called keratinization or cornification. As the cells closest to the surface are shed, new cells form beneath them, eventually becoming corneocytes and being shed as well. This constant renewal of cells helps to create a protective barrier for the skin.
In the case of hair, as cells multiply and make keratin to harden the structure, they are pushed up through the skin's surface as a shaft of hair. Similarly, nails are formed by the accumulation of nail cells, which are also made of keratin. As the nail cells push forward, they form the hard part of the nail that we can see.
Keratin comes in two types: primitive, softer forms found in all vertebrates, and harder, derived forms found only in sauropsids (reptiles and birds). The harder beta-keratins are found in the nails, scales, and claws of reptiles and the feathers, beaks, and claws of birds. Keratin is extremely insoluble in water and organic solvents, contributing to the toughness and strength of the structures it forms.
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Hair growth occurs at the base of the hair root
The process of hair growth occurs in distinct sequential stages. Anagen is the active growth phase, during which the root of the hair divides rapidly, adding to the hair shaft. During this phase, hair grows about 1 cm every 28 days. The hair follicle is in the catagen phase when the hair transitions from the growing phase to the resting phase. This phase takes about two weeks, during which the hair detaches from its blood supply. The telogen phase is the inactive phase, where the hair sheds or falls out of the hair follicle. This phase can last up to four months.
The hair follicle is a tube-like structure within the skin that surrounds the root and strand of hair. Hair follicles are microscopic and vary in size based on the cells that make up the base of the structure. They are composed of layers of cells within the skin's layers. These cells create a tube-like structure to hold the hair in place. The outer root sheath (ORS) provides structural support, while the inner root sheath (IRS) moulds the developing hair shaft.
The papilla, a large structure at the base of the hair follicle, is where the actual hair growth occurs. It contains an artery that nourishes the root of the hair. As cells multiply and produce keratin to harden the structure, they are pushed up the follicle and through the skin's surface as a hair shaft. This process is called keratinization. As this happens, the hair cells die, and the dead cells and keratin form the shaft of the hair.
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Nails grow from the nail matrix, the root of the nail
The nail matrix, also known as the matrix unguis, keratogenous membrane, or onychostroma, is the root of the nail. It is the active tissue that generates cells, which harden as they move outward from the nail root to the nail plate. The nail plate is the hard part of the nail that is visible. The nail matrix is the "root" of the nail responsible for its growth.
The nail matrix is the part of the nail bed that is beneath the nail and contains nerves, lymph, and blood vessels. The nail bed extends from the edge of the nail root, or lunula, to the tissue known as the hyponychium. The lunula is the whitish crescent-shaped area at the base of the nail. The nail bed contains blood vessels, nerves, and melanocytes that produce melanin, which gives skin its colour. As the root grows, the nail moves down along the nail bed and adds material to the underside of the nail to make it thicker.
The matrix produces cells that become the nail plate. The width and thickness of the nail plate are determined by the size, length, and thickness of the matrix, while the shape of the fingertip bone determines whether the nail plate is flat, arched, or hooked. The matrix will continue to produce cells as long as it receives nutrition and remains in a healthy condition. As new nail plate cells are made, they push older nail plate cells forward, and in this way, older cells become compressed, flat, and translucent.
The nail is made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. Keratin is a protein found in nails, hair, and skin that works to protect against infection. The process of keratinization, where cells form a hard protein called keratin, also occurs in hair growth.
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Fingernails grow faster than toenails
Hair and nails are part of the integumentary system, which is the body's outer layer and first line of defence against bacteria, injury, and sunlight. Nails grow out of deep folds in the skin of the fingers and toes. As epidermal cells below the nail root move up to the surface of the skin, they increase in number. Each cell becomes a thin plate, and these plates pile into layers to form the nail. As with hair, nails form by keratinization, a process in which cells form a hard protein called keratin.
While there are no scientifically proven methods to make nails grow faster, frequent nail clipping may promote nail growth. Taking biotin can also help strengthen nails and prevent them from breaking, allowing them to remain long as they grow.
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Frequently asked questions
Hair and nails grow from epidermal cells. In the case of hair, these cells are located at the base of the root. For nails, the epidermal cells are located below the nail root.
As epidermal cells multiply, they form a rod of tissue in the skin. These rods of cells move upward through the skin as new cells form beneath them. As they move up, they are cut off from their nourishment supply and start to form keratin, a hard protein. This process is called keratinization. The dead cells and keratin then form the shaft of the hair or the nail plate.
Hair grows faster in the summer than in the winter, and slower at night than during the day. Nails also grow faster in the summer. Fingernails grow at a rate of about 3 millimeters per month, while toenails grow at about half that rate. The actual growth rate of nails depends on various factors such as age, sex, exercise level, diet, and hereditary factors.
