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What are the 6 functions of the integumentary system?
Protects from infection.
Helps regulate temperature.
Sensory perception.
Melanin for pigmentation via melonacytes.
Vitamin D absorption.
Absorbs fat-soluble vitamins
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How many main layers does the integumentary system have and what are they?
3.
Epidermis – the outer layer with many sub-layers.
Dermis – tough elastic layer.
Hypodermis – insulates the body
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What is the name of the 3rd layer?
Hypodermis
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Describe the epidermis
The outer layer with many sub-layers. Has no nerve endings or blood. Important for protection, melanin production and Vitamin D production
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What structures of the integumentary system pass through the epidermis?
Hair, sebaceous glands and sweat ducts
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How are the epidermis and the dermis attached?
By upward projections
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Describe the dermis.
Tough and elastic. Important for movement. Made of connective tissue and collagen
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The dermis consists of?
Sweat gland, blood vessels, lymphatic vessels, nerve fibres, hair follicles, sebaceous glands, sweat glands
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Describe the hypodermis
Insulates the body, and is a shock absorber. Made of fatty adipose.
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The hypodermis consists of...?
Fatty adipose. It is also a bed for capillaries, nerves and sweat ducts
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What are the 6 effects of ageing on the skin?
The dermis and epidermis become thinner.
Less elasticity
Less efficient thermoregulation
Reduced sebum.
Less vitamin D productionMelanocytes are less active, and more likely to sunburn
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