AHS 100 Chapter Notes - Chapter 3: Hair Follicle, Keratin, Moisturizer
Chapter 3: The Integumentary System- Dermatology
●Skin serves as an outer protective barrier, skin is the first line of
defense from germs and irritants. It also serves as the body’s first
point of contact with its surroundings.
●Our skin is the largest organ
3.1: Word Parts of the Integumentary System
●The outermost layer of the skin, the one that is visible is called the
epidermis. It is made of large cells that look like scales of a fish
under a microscope.
○Squamous cell: the scaly appearance
●Under the epidermis, lies a deeper layer called the dermis. This layer
is much thicker than epidermis but contains fewer cells and more
thick fibers to give the skin strength and flexibility. House to hair
follicles, nerves, and glands
○Hair follicles: roots of your hair. They anchor to the skin and
provide nourishment
○Nerves of dermis: detect fine pressure, temperature, and pain.
Due to the large amount of nerves, it makes the skin the largest
sensory organ of the body
○Two skin glands:
■Sweat glands- release sweat to rid the body of waste and
control the body
■Sebaceous glands: secrete oil as a natural moisturizer
for the skin and hair
○End of fingers and toes have nails: a specialized tissue made
of a hard substance (keratin). Nails protect and provide a good
base for movement.
○adip/o-lip/o-steat/o-fat
○cutane/o-derm/o-dermat/o- skin
○pil/o-trich/o- hair
○hidr/o- sweat
○squam/o- scale
○onych/o-ungu/o-nail
○seb/o-sebace/o- oil
○crypy/o- hidden
○ichthy/o- scaly
○kerat/o- hard, horny
○pachy/o- thick
Document Summary
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