Integumentary system

Question 1

What is the integumentary system composed of?

Answer 1

Skin, hair, oil, sweat glands, nails and sensory receptors.

Question 2

There are 2 main parts of the skin. what are they?

Answer 2

Epidermis and dermis

Question 3

What is the epidermis composed of?

Answer 3

epithelial tissue

Question 4

What is the dermis composed of?

Answer 4

dense irregular connective tissue.

Question 5

The epidermis is composed of keratinised stratified squamous epithelium. It contains 4 main principle types of cells. What are they?

Answer 5

Keratinocytes
Melanocytes
Intraepidermal macrophages
Tactile epithelial cells.

Question 6

Keratinocytes?

Answer 6

90% of the epidermal cells are arranged in 4 or 5 layers and produce a protein called keratin.

Question 7

Melanocytes?

Answer 7

8% of the cells and produce a pigment called melanin.

Question 8

intraepidermal macrophages?

Answer 8

(langerhan cells) participate in immune responses.

Question 9

Tactile epithelial cells?

Answer 9

detect touch senstations.

Question 10

The epidermis has 4 layers. What are they?

Answer 10

stratum basale
stratum spinosum
stratum granulosum
stratum corneum

Question 11

stratum basale?

Answer 11

deepest layer

Question 12

stratum spinosum?

Answer 12

provides stength and flexibility

Question 13

stratum granulosum?

Answer 13

Keratinocytes undergo apoptosis here (genetic programmed cell death)

Question 14

stratum corneum?

Answer 14

most superficial layer

Question 15

The palms and soles (thick skin) have 5 layers. What is it?

Answer 15

stratum lucidum which is only found in thick skin and is located between the granulosum and corneum.

Question 16

what does the dermis contain?

Answer 16

Collagen and elastic fibres

Question 17

The superficial part of the dermis makes up about 1/5 of the thickness of the total layer. What does it consist of?

Answer 17

Areolar connective tissue which contains fine elastic fibres.

Question 18

The surface area of the dermis is greatly increased by what….?

Answer 18

small, fingerlike projections called dermal papillae
touch reseptores
free nerve endings.

Question 19

what does the deepest part of the dermis contain?

Answer 19

collagen and coarse elastic fibres

Question 20

what cells are found between the fibres in the deepest part of the dermis.

Answer 20

Adipose cells
hair follicles
nerves
oil glands
sweatglands.

Question 21

what are the 3 pigments that impart a wide variety of colours to skin.

Answer 21

Melanin
Hemoglobin
carotene

Question 22

What are the accessory structures of the skin that develop from the epidermis of an embryo?

Answer 22

Hair
nails
glands