SKIN anatomty ]

Question 1

what percentage of the bodys weight does the skin take up

Answer 1

16%

Question 2

What is the size of the skin on a human

Answer 2

1.5-2 M^2

Question 3

What makes human skin unique

Answer 3

The ability to sweat to cool the body down

Question 4

What is the name of the skin + accociated structures

Answer 4

Integumentary system

Question 5

What are 8 functions of the inteumentary system

Answer 5

1. Produce keritin water resistant
2. Produce Vitamine D3
3. Produce melenin UV protection
4. protective barrier
5. Excreate water = temp control
6. detect touch pressue etc connect to nervous
7. store adipose for insulation + energy
8. Excreate salt and waste

Question 6

What are the three layers of the skin + facts

Answer 6

Epidermis - strattified barrier, avascular, prodominently keritinocytes

Dermis - filled with blood vessles and protein stuctures

Hypodermis - Filled with adpocytes making subcutaneous fats

Question 7

What are the three forms of epithelial cells + two forms of these cells

Answer 7

Simple or stirated

columnar
cuboidal
squamous

Question 7

What type of epithelia is the epidermis prodominently made from

Answer 7

Straitted squamous epithelia

Question 8

what makes up the cutaneous layer of the skin

Answer 8

epidermis + dermis

Question 9

What are the functions of the 4 main layers of skin

Answer 9

stratum corneum - dead dried cells without nucleus which flakes off

Stratum granulosum - contains granules which dries out cells + promotes keritin cross links, secreates waxy substance to create water resistant barrier

Stratum spinosum - increasingly flat cells as they move up linked via desmosomes

Stratum basale - columnar stem cells divide to create daughter cells which replace layers above

Question 9

What are the 4 main layers of the epidermis + the extra layer in thick skin

Answer 9

stratum corneum
stratum lucium - only thick skin
stratum granulosum
stratum spinosum
stratum basale

Question 10

What are the two layers of the dermis + functions

Answer 10

Papillary layer - highly vascularised tissue

reticular layer - mesh structure made of cologen + elastin fibers

both contain, Blood, lymph, nervous + acesssory structures

Question 11

What are the plexus of the dermal layer

Answer 11

cutaneous plexus- provies acessory structures with nutriance located between dermis + hypodermis

subpapillary plexus - blood vessles which supply the epidermis and upper dermis with nutriance

Question 12

What is the hypodermis prodominently made from

and functions

Answer 12

adipocyes which make up subcutaneous fat layer - stores energy + insulation
Location of hypodermic needle injection

Question 13

first degree burn symptoms

Answer 13

superficial burns on the outer layer of epidermis
Creates erythmea (redness of the skin)
take 3-10 days to heal
function of the skin intract

Question 14

Second degree burn symptoms

Answer 14

Epidermis + some of the dermal layers damaged
painful, moist, blistering
takes 1-2 weeks to heal.

Question 15

survear second degree burns

Answer 15

white + waky look
around 1 month to heal
may have loss of sensation + damage to acessotry structures

Question 15

third degree burns

Answer 15

Compleate damage to epidermis mermid and hypodermis - damages acessory structures no pain as nerve endings burnt off - wakes months to heal and may require skin graphs

Question 16

What are the dermal papillae

Answer 16

projections from the dermis into the epidermis adjacent to the epidermal ridges
functions
-increase thermoregulation
-closely bind the dermis + epidermis