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amanda430
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What does the integumentary system consist of?
skin, hair, nails
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What are the primary functions of skin?
- Protection
- sensory input
- produces vit D
- secretes sweat, urea and lactic acid
- expresses emotion (blushing)
- repairs surface wounds
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What are the 3 layers of the skin?
Epidermis, Dermis, Subcutaneous (hypodermis)
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What is the Epidermis made of?
Stratified squamous epithelium
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Describe the blood supply to the epidermis
Avascular
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What is the deepest layer of the epidermis called?
Stratum Germinativum
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What is Keratinization and where does it occur?
- keratin is deposited, causes cells to be flat, hard and waterproof
- Stratum Germinativum (deepest layer of epidermis)
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What is the outermost layer of the epidermis?
Stratum corneum
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How long does it take for epidermis cells to be replaced?
4 weeks, 30 days
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What is contained in the epidermis?
hair roots, apocrin sweat glands, ecrin sweat glands, sebaceous glands
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What determines skin color?
Melaninocytes
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Describe the vascularity of the Dermis
Highly Vascular Connective Tissue
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What are the two types of sweat glands?
- eccrine-regulate temp, most common
- Apocrine- larger, deeper, make body odor
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What is the thickness of the Dermis?
1-4mm depending on where it is
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What are the appendages in the integumentary system?
hair, nails, glands
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What does the Eccrine gland do?
regulates temp, located all over the body
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What does the Apocrine gland do?
- found in axillae (arm pit), ano-genital, Pinna
- secretes odorless fluid in reaction to emotions
- when decomposition of Apocrine sweat occurs you get body odor
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Describe Sebaceous Glands
- secretes sebum to help hair and skin stay hydrated
- all over except for palms and soles
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What are the 3 parts of a hair follicle?
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What is the nail?
epidermal cells converted to hard plates of keratin
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What is the white base of your nail called?
Lunula
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Describe the tissue underneath the nail
- highly vascular
- Capillary Refill-tells how blood circulation is
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Describe the problems with skin in babies
unable to regulate temp and prevent fluid loss
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