Chapter 5 Integumentary System

Question 1

7 Major Functions of Skin

Answer 1

Thermoregulation via negative feedback
Protection, physical chemical & biological barrier
Cutaneous Sensations
Excretion and Absorbion - Sweat secretion, Absorb heavy metals
Synthesis of Vitamin D
Blood Resivor - Stores up to 5% of blood supply
Immunity

Question 2

What are the 2 major regions of skin

Answer 2

Epidermis & Dermis

Question 3

Epidermis

Answer 3

Outermost superfical layer

Question 4

Dermis

Answer 4

Vascular middle region

Question 5

Hypodermis

Answer 5

Deepest region- not part of the skin!

Question 6

4 Types of epidermal cells

Answer 6

Keratincytes- 90%
Melanocytes- produces melanin-skin pigement
Dendritic Cells - Found in bone marrow
Merkel Cells- Deepest layer of epidermis fuctions as touch receptors

Question 7

Basale Layer

Answer 7

deepest Epidermis layers
single layer of keratinocytes
Rapid Cell Division
Keratinocytes, Melanocytes and Merkel cells found here

Question 8

Stratum Spinosum (prikely layer)

Answer 8

8-10 rows of tightly packed cells

Langerhans and Grandual found here

Question 9

Stratum Granulosum (Granular layer)

Answer 9

3-5 rows of flattened Keratincytes
Different colours
lamellated grandules release lipids=waterproof=death

Question 10

Stratum Lucidium

Answer 10

Not found in all layers of skin- only hands and feet

3-5 layers of clear flat dead cells

Question 11

Stratum Corneum

Answer 11

25-30 layers of flat dead cells filled with keratin

Question 12

How many Epidermal layers are there

Answer 12

4-5