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What is a hair shaft?
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9. Shafts of hair are composed of a. living dermal cells. b. dead dermal cells. c. living epidermal cells. d. dead epidermal cells
Aug 31, 2023 · The hair shaft refers to the visible part of the hair that extends beyond the scalp's surface. It's composed of a protein called keratin, which provides strength and structure to each strand of hair. The hair shaft is a remarkable structure that plays a key role in determining the texture, thickness, and appearance of your hair.
The typical mammalian hair consists of the shaft, protruding above the skin, and the root, which is sunk in a pit ( follicle) beneath the skin surface. Except for a few growing cells at the base of the root, the hair is dead tissue, composed of keratin and related proteins.
- The Editors of Encyclopaedia Britannica
Jan 17, 2023 · Key Points. Hair primarily serves for protection, warmth, and sensation. Human hair is made of keratin. The structure of the hair follicle includes the papilla, matrix, root, and bulb.
- Fashion Statement
- What Is hair?
- Structure of Hair
- Characteristics of Hair
- Functions of Hair
- Hair in Human Evolution
- Social and Cultural Significance of Hair
This colourful hairstyle makes quite a fashion statement. Many people spend a lot of time and money on their hair, even if they don’t have an exceptional hairstyle like this one. Besides its display value, hair actually has important physiological functions.
is a filament that grows from a in the of the skin. It consists mainly of tightly packed, keratin-filled cells called . The human body is covered with hair follicles, with the exception of a few areas, including the mucous membranes, lips, palms of the hands, and soles of the feet.
The part of the hair located within the follicle is called the .The root is the only living part of the hair. The part of the hair that is visible above the surface of the skin is the hair shaft. The shaft of the hair has no biochemical activity and is considered dead.
Two visible characteristics of hair are its colour and texture. In adult males, the extent of balding is another visible characteristic. All three characteristics are genetically controlled.
In humans, one function of head hair is to provide insulation and help the head retain heat. Head hair also protects the skin on the head from damage by . The function of hair in other locations on the body is debated. One idea is that body hair helps keep us warm in cold weather. When the body is too cold, muscles contract and cause hairs to stand...
Among mammals, humans are nearly unique in having undergone significant loss of body hair during their evolution. Humans are also unlike most other mammals in having curly hair as one variation in hair texture. Even non-human primates (see Figure 10.5.7) all have straight hair. This suggests that curly hair evolved at some point during human evolut...
Hair has great social significance for human beings. Body hair is an indicator of biological sex, because hair distribution is . Adult males are generally hairier than adult females, and facial hair in particular is a notable secondary male sex characteristic. Hair may also be an indicator of age. White hair is a sign of older age in both males and...
- Christine Miller
- 2020
The hair shaft (HS) is a key cornified component of the mature hair follicle (HF), situated at the center of the HF. HS is formed during upward growth and differentiation of the matrix cells and is comprised of three distinct cell layers: the innermost medulla, the cortex and the hair shaft cuticle.
Nov 21, 2023 · At the basic level, each hair strand of hair consists of two crucial parts: the root and the shaft. The root is the living segment located in the dermis, the second layer of the skin, while the shaft refers to the visible part that extends above the skin’s surface.
