Chapter 5 - Integumentary System

Question 1

Parts of the Integument (aka, Cutaneous Membrane)

Answer 1

1. Epidermis
2. Dermis
3. Hypodermis (not technically part of the skin)

Question 2

Integumentary System Functions

Answer 2

1. Protection
2. Excretion and Secretion
3. Thermoregulation
4. Stores and Synthesizes
5. Sensory Detection

Question 3

Cells of the Epidermis

Answer 3

1. Keratinocytes, 90%, produce keratin
2. Melanocytes - 8%, color and UV absorption
3. Langerhans/Dendritic cells - 2%, immunity
4. Tactile/Merkel cells - 2%, touch

Question 4

Epidermal Layers

Answer 4

Stratas:

1. Corneum
2. Lucidum
3. Granulosum
4. Spinosum
5. Basale

Question 5

Stratum Corneum

Answer 5

Water repellent layer, 2-30 layers of dead keratinized cells

• Anucleate cells
• Hornlike layer

Question 6

Stratum Lucidum

Answer 6

Only present on thick skin (palms and soles), 3-5 layers of dead keratinocytes

• Lucidum = clear
• Glassy look

Question 7

Stratum Granulosum

Answer 7

The keratinocytes stop dividing and start produces keratin

Question 8

Stratum Spinosum

Answer 8

Spiny appearance, Immune cells to protect against

-Langerhans

Question 9

Stratum Basale (germinativum or basale

Answer 9

Cells are undergoing mitosis 90%; contains keratinocytes

Question 10

Sweat pH and composition

Answer 10

pH ranges from 4 - 6.8

99% water and 1% sodium chloride

Question 11

Melanocytes

Answer 11

Gives our skin and hair color

Question 12

Three accessory structures that are part of the integumentary system

Answer 12

1. Hair
2. Nail
3. Exocrine Glands

Question 13

Hypodermis

Answer 13

Layer below the skin - made of mostly adipose tissue. Provides storage of Vitamin A for the skin

Aka: Subcutaneous layer or Superficial Fascia