Homeostasis and Urea

Question 1

What is Homeostasis?

Answer 1

The maintenance of a constant internal environment

Question 2

What 4 things does Homeostasis do?

Answer 2

1. Removal of waste - Carbon Dioxide and Urea
2. Controls the concentration of water and ions in the body
3. Maintains the glucose concentration
4. Controls the body temperature (37 degrees C)

Question 3

What is Urea?

Answer 3

A waste product formed by the break down of amino acids

Question 4

What does your body do if you eat too much protein?

Answer 4

It removes the amino groups and converts them to Urea

Question 5

What does the Thermoregulatory Centre in your brain do?

Answer 5

Monitors your body temperature (blood and skin) and triggers different responses

Question 6

What happens if your body temperature gets too hot?

Answer 6

• Your hairs will lie flat
• You sweat, which evaporates and removes the heat
• Vasodilation occurs which increases the blood flow to the skin, transferring heat quicker

Question 7

What happens if your body temperature gets too cold?

Answer 7

• Your hairs stand up (creating an insulating layer)
• Blood capillaries constrict (reducing blood supply to skin)
• You shiver, your muscles contract which needs respiration which releases energy to warm the body