Homeostasis

Question 1

Roles of the skin

Answer 1

• Sense organ for pain, touch, pressure
• Controls heat loss
• Barrier - prevents entry of pathogens
• Prevents water loss
• Tough outer layer

Question 2

Homeostasis

Answer 2

Maintaining a stable internal enviroment

Question 3

What happens to our bodies when we are too hot?

Answer 3

• We sweat, this then evaporates and cools body
• Hairs lie flat on body, meaning less insulating air is trapped close to body.
• vasodilation, more heat radiated

Question 4

What happens to our bodies when we are too cold?

Answer 4

• Shiver, contraction of muscles releases heat.
• Vasoconstriction, less heat radiated
• Hairs stand up, more insulating air trapped close to body.

Question 5

Adrenaline

Answer 5

Source - Adrenal gland
Role - Readies body for ‘flight or fight’ response
Effect - Increases heart and breathing rate