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BNNS501 Exam 1 Guide With Complete Solution
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BNNS501 Exam 1 Guide WithComplete Solution
What are the 6 main functions of the skin?
1. Prevents loss of moisture
2. Reduces harmful effects of UV radiation
3. Acts as a sensory organ
4. Helps regulate temperature
5. Production of Vitamin D
6. Provides a protection barrier against mechanical, thermal and physical
injury
what are the 3 layers of skin?
Outer layer = Epidermis
Middle layer = Dermis
Bottom layer = Hypodermis
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What are the functions of the 3 layers of skin?
Epidermis = Protects the body from the external environment (forms
protective barriers)
Dermis = Support and protect the skin and deeper layers, assist in
thermoregulation and aid in sensation
Hypodermis = It insulates the body, connects the dermis layer to muscles and
bones, and stores energy
What is the function of Keratinocytes?
produce keratin which protects the skin and underlying tissue from heat,
microbes and chemicals as well as providing a waterproof sealant
What is the function of Melanocytes?
provides melanin, which contributes to skin color and absorbs ultraviolet
light
what are the 3 main pigments that normally affect skin color?
,1. melanin
2. Carotene
3. Hemoglobin
name the changes that can occur to older skin
1. Wrinkling
2. Reduced sweat production
3. blood vessel walls thicken
4. sebaceous gland atrophy
5. poor skin healing
6. Hair loss
7. Melanocytes decrease in number
Where does hair growth start from?
The Matrix (think movies)
Factors that affect hair growth
Advancing age
severe burns
genetics
What are the 4 tissue types found in the skin?
1. Epithelial - Covers most internal and external organs
2. Connective - binds tissues and organs together, and supports organs in
, their location and is a storage for nutrients
3. muscle - Enables voluntary and involuntary movement
4. Nervous - Highly specialized cells that receives and transmit electrical
impulses
What are the characteristics of epithelial tissue?
- is POLOR (means one side of the tissue is structurally different to the other)
- Is AVASULAR (it contains no blood vessels), but is INNERVATED (contains
nervous tissue)
- Is supported by connective tissue
what are the functions of the epithelial tissue?
- Protects
- sensory
- secretion
- absorption
- Excretion
Where is epithelial tissue
- skin
- upper respiratory tract
- urinary bladder
- vagina
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