Integumentary System

Question 1

functions of integumentary system

Answer 1

1. regulate body temperature due to capillaries, hair
2. protects body from environment
3. gets info from environment via sensory organs
4. excret water, salt, urea
5. helps with immune system
6. capillaries store blood
7. create vitamin D when exposed to UV radiation structure

Question 2

types of epithelial cells

Answer 2

• simple squamous
• simple cuboidal
• simple cuboidal
• simple columnar
• stratified for each of them
• transitional
• pseudostratfied columnar

Question 3

epidermis

Answer 3

upper layer, no blood vessels, help waterproof our body
* skin created in bottom layer of epidermins, as they go upwards, they lose organells and start mass producing keratin

Question 4

dermis

Answer 4

connective tissue, has blood vessels/nerves/glands/hair follicles
* contains collagen, elastic fibers
* glands include sebaceous glands which create oil, sweat glands which create sweat
* 2 layers: papillary (more superfiical and responsible for finger prints), reticular (deeper and thicker, made of dense irregular connective tissue)

Question 5

hypodermis

Answer 5

• deepest layer and contains larger nerves and blood vessels
• loose CT and adipose (fat) tissue = main function is fat storage

Question 6

sudoriferous (sweat) gland

Answer 6

• eccrine glands (sweat glands): over entire body and important for thermoregulation
• apocrine glands: specific sites (secrete into hair follicle ex: ear wax or milk

Question 7

sebaceous glands

Answer 7

• all over the body (except palms and soles)
• secrete sebum (oils + wax) into hair follicle

Question 8

layers of human skin

Come Lets Get Some Beers

Answer 8

• stratum corneum
• stratum lucidium
• stratum granulosa
• stratum spinosum
• stratum basale

Question 9

stratum corenum

Answer 9

corneocytes (dead kertainocytes) form outermost, protective layer

Question 10

stratum lucidum

Answer 10

dead kertainocytes that are not yet fully differentiated into corenocytes

Question 11

stratum granulosum

Answer 11

• kerationcytes secrete lamellar bodies to form water-barrier

Question 12

stratum spinosum

Answer 12

important for strength (desomosomes) and immunity (Langerhans cells)

Question 13

stratum basale

Answer 13

• deepest layer, the basement membrane –> separates it from dermis
• precursor kertinocyte stem cells proliferate her
• layer of skine protects it from UV radiation