click below
click below
Normal Size Small Size show me how
68C Ch.6 Ph.1 T.3
Hole's Essentials of A&P Chapter 6: Integumentary System
Question | Answer |
---|---|
Functions of the skin | Retarding water loss, body temperature regulation, sensory reception, excretion, protective covering |
Describe how skin plays a role in vitamin D production | Dehydrocholesterol synthesized by cells in the digestive system. Reaches skin by blood, exposed to UV rays, converted to vitamin D |
Function of melanin | Absorbs UV rays in sunlight, preventing it from causing mutations |
Factors influencing skin color | melanin, sunlight, blood, diet, biochemical imbalances |
Eccrine gland | most numerous glands, respond to body temperature by environmental heat. located on forehead, neck, back, release moisture |
Apocrine gland | sweat glands that begin at puberty, most numerous in axillary and groin regions |
Explain how body heat is produced | During physical exercise muscles release heat, blood carries heat away, reaches hypothalamus in brain(hypothalamus controls set point) |
Eumelanin produce | brownish-black |
Phoemelanin produce | reddish-yellow |
Keratinization | older cells harden, form a layer known as stratum corneum |
Statum Lucidum | thickened and hairless skin of the palms and soles |
Stratum Corneum | Outermost layer dead cells |
Melanocytes | Produces melanin in the deepest layer of the epidermis |
The cells of the epidermis that reproduce are in the | stratum basale |
Which layer of epidermis can only be found in the thickened skin of the palms and soles? | stratum lucidum |
The sebaceous glands of the skin are | holocrine glands |
The nail plate is formed by specialized cells in the.. which layer? | epidermis |
Where are the sweat glands most numerous | head and neck |
A scar is formed by | newly formed connective tissue |
The function of sebum is to | keep the skin and hair soft and waterproof, sebum is oily. |
The layer of skin that has cells containing cytoplasm filled with keratin is the | stratum corneum |