Unit 23 - Forensic Evidence, Collection and Analysis
Institution
PEARSON (PEARSON)
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Unit 23 - Forensic Evidence, Collection and Analysis
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Khansa Zahid
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Unit 23 aim c and d
, P5
Hair
Biological:
The hairs each originate from a distinct hair follicle. Every hair follicle's bottom is home to the
hair bulb, which houses the cells that will eventually develop into your hair. These keep
splitting and pushing forward, progressively becoming harder. They organise itself into six
layers as they arrive at the top of the bulb. The cuticle, cortex, and medulla are the three
core layers that combine to form the hair; the medulla does not always become present,
particularly in hairs with a smaller diameter. The follicle's lining is made up of the first three
layers. The portion of the hair that's also visible over the head is called the hair shaft.
Keratin, a protein, is compressed and bonded together to create it.
The substance that makes up nails, hooves, feathers, and claws is keratin. The protein
keratin is exceptionally tough and immune to deterioration. Disulphide bonds and hydrogen
bonds, two different types of bonding, hold everything together. Your hair's cuticle, which is
made up of overlapping cells and is oriented downhill, is its protective coat. Clear and level
cuticles indicate good health. This provides your hair lustre and guards against harm to the
inner layers. Additionally, it lessens the migration of moisture into and out of the basal
cortex, keeping the elasticity and equilibrium of hydration in your hair. Nevertheless,
chemical reactions and exposure to the elements can raise the cuticle and upset this
equilibrium, leaving your hair dry and fragile. The primary volume and colour of the hair are
formed by the cortex. Prolonged keratin strands that are connected by disulphide and
hydrogen bonds make up this structure. Your cortex's functioning is primarily dependent on
the strength of the cuticle that surrounds it. Finally, the deepest level of the hair is called the
medulla, and it is only found in thicker hair textures. It has an airy, translucent core made up
of delicate, thin cells. (,2.)
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