The Integumentary System

Question 1

Which is the largest organ in the body?

Answer 1

Skin (by surface area and weight)

Question 2

What is the surface are of skin?

Answer 2

2m^2/ 22 sq. feet

Question 3

What is the weight of skin?

Answer 3

Around 16% of body mass/ 4.5 - 5 kg

Question 4

What is the average thickness of skin?

Answer 4

1-2 mm

Question 5

Where is the thickest skin found?

Answer 5

Soles of feet; 4 mm

Question 6

Where is the thinnest skin found?

Answer 6

Eyelids; 0.5 mm

Question 7

What are the two layers of the skin?

Answer 7

Epidermis and dermis

Question 8

What is the function of hypodermis?

Answer 8

Not a skin layer.
* Provides insulation.
* Cushioning to skin and organs.
* Provides support.

Question 9

What is the kind of tissue found in epidermis?

Answer 9

Keratinised stratified squamous epithelial tissue.

Question 10

What are the kinds of cells found in the epidermis?

Answer 10

1. Keratinocytes
2. Melanocytes
3. Langerhans cells
4. Merkel cells

Question 11

What is the function of kerantinocytes?

Answer 11

• 90% of epidermis
• Produce fibrous protein called keratin that provide protection.

Question 12

What is the function of melanocytes?

Answer 12

Produce melanin that protects against UV radiation.

Question 13

What is the function of Langerhans cells?

Answer 13

Involved in immune response.

Question 14

Where do langerhans cells arise from?

Answer 14

Red bone marrow

Question 15

What is the function of merkel cells?

Answer 15

Touch and sensation