Lecture One - Skin Flashcards
1
Q
How much of your body weight is contributed by skin
A
16%
2
Q
How much surface are does skin cover
A
1.5-2m^2
3
Q
Why did we adapt to have bare sweaty skin
A
- climate change meant we started running in open grass land
- no hair meant efficient heat loss - through sweat glands
4
Q
Functions of skin and accessory structures
A
- Protect underlying tissue and organs from impact, abrasion, fluid loss and chemical attack
- Ecrete salt, water and organic wast through intergumentary glands
- Maintain a constant body temperature through evaporative cooling and insulation
- Production of melanin which protects underlying tissue from ulatraviolet radiation
- Produciton of keratin which protects from abrasion and serves as a water repellant
- Synthesis of vitamin D3, a steroid which is subsequently converted into calcitriol, a hormone important to normal calcium metabolism
- Store lipids in adipocytes in the dermis and in adipose tissue in the subcutaneous layer
- Detect touch, pressure, pain and temperature stimuli, and reply that information to the nervous system
5
Q
Skin is a ____ organ
A
- composite
- made of all tissue types
6
Q
Primary layers of the skin
A
- epidermis (cutaneous)
- dermis (cutaneous)
- hypodermics (subcutaneous)
7
Q
Features of the epidermis
A
- stratified barrier
- mostly keratinocytes
- no blood circulation (avascular)
8
Q
Features of the dermis
A
- protein fibres for strength (collagen and elastin)
- vascular (nourishes epidermis)
9
Q
Features of the hypodermis
A
- adipose tissue
10
Q
A
11
Q
What is the predominant tissue of the epidermis
A
Epithelial tissue
12
Q
What kind of epeithelia is the epidermis made of
A
Stratified squamous epithelium
13
Q
A
Simple squamous
14
Q
A
Simple Cuboidal
15
Q
A
Simple columnar
16
Q
A
Stratified squamous
17
Q
A
Stratified cuboidal
18
Q
A
Stratified columnar
30
Q
A
31
Q
A
