Tissue

Question 1

what makes up the integumentary system?

Answer 1

• skin
• hair
• nails
• glands

Question 2

Functions of the skin?

Answer 2

• protection
• eliminates waste products
• regulates body temperature/ thermoregulation
• sensation
• manufacture of vitamin D

Question 3

Structure of the skin?

Answer 3

• outer layer called the epidermis, made of stratified squamous tissue
• inner layer called the Dermis, made of elastic fibrous connective tissue
• Epidermis overlays Dermis

Question 4

What tissue is the epidermis made from?

Answer 4

stratified squamous tissue

Question 5

What tissue is the dermis made from?

Answer 5

Elastic fibrous connective tissue

Question 6

What is Keratin?

Answer 6

• a protein inside skin cells
• based in the outmost layers of skin
  serves important structural and protective functions
• provides skin with waterproof layer
• provides strength
• able to resist friction

Question 7

Structure of Epidermis?

Answer 7

• inner layer = basal layer
• outer layer = corneum layer

Question 8

Use of basal layer?

Answer 8

is where cells are produced divide and move to the outer layer
this is to replace old and dead cells removed by friction

Question 9

use of corneum layer?

Answer 9

where cell exchange become flat packs of keratin, embedding into a lipid

Question 10

Overview of skin?

Answer 10

• largest, heaviest and most active organ
• surface area of 1.5-2 square metres
• skin is a barrier between the individual and external environment
• skin is an indication to health

Question 11

Overview of Dermis ?

Answer 11

• inner part of skin
• composed of fibrous connective tissue with bundles of collagen and elastic fibres that provide support, elasticity and resistance
• dermis has a blood and never supply that contains a vast network of blood and lymphatic capillaries and nerve endings

Question 12

What is the dermis composed of?

Answer 12

composed of fibrous connective tissues
- bundles of collagen and elastic fibres

(to provide support/elasticity/resistance)

Question 13

What does the dermis have that the epidermis doesn’t?

Answer 13

• a blood and nerve supply
• a network of blood, lymphatic capillaries and nerve endings

Question 14

skins 3 layers?

Answer 14

• epidermis
• Dermis
• subcutaneous layer

Question 15

subcutaneous layer?

Answer 15

• 3rd layer of skin
• made up of fat to insulate the body

Question 16

what is epidermis layer made up of ?

Answer 16

keratin

Question 17

what is the dermis vascularised by?

Answer 17

• is vascularised by arterioles and venules to bring a blood supply to the skin, important, so that nutrients are brought for growth and development.
• this layer also contains hair follicles, nerves and sweat glands which have important functions in body

Question 18

what does skin provide protection from?

Answer 18

• harmful pathogens
• mechanical damage
• radiation
  weak acids and alkalis
• thermoregulation - temperature control