Integumentary System Flashcards
What 3 things make-up the integumentary system?
integument, hypodermis, appendages
What is the largest organ of the body?
skin
What are the two layers of skin?
epidermis, dermis
What type of epithelia is the epidermis?
stratified squamous
What type of connective tissue is the dermis?
Dense irregular connective tissue
The epidermis is made of what?
epithelium
The dermis is made of what?
connective tissue
The hypodermis is made of what?
subcutaneous tissue (loose connective tissue proper)
What are the six functions of the skin?
protection, temp regulation, water retention, excretion, production of vitamin D, and sensory reception
In what 3 ways does skin protect your body?
immune defense, UV radiation, contact wear
What two mechanisms aide in temperature regulation?
capillaries and sweat glands
What does skin excrete through sweat?
urea, salts, and water
What is the name of the specialized squamous cells of the skin?
keratinocytes
What protein do keratinocytes produce?
keratin
What does keratin do for the protection of skin?
prevent mechanical wear, produces antibiotics
What layer of the epidermis is the most active and is constantly undergoing mitosis?
basal layer
As cells reach the apical surface, they ______ and are filled with _____
die, keratin
What happens to keratinized cells when they encounter friction?
they are rubbed off
How many layers are in thick skin?
5
Where is thick skin found?
soles of feet and palms of hands
How many layers are in thin skin?
4
Where is thin skin found?
everywhere over the body
What is the most basal layer of skin?
stratum basale
What is stratum basale composed of?
a single row of cuboidal stem cells