Unit 3 - Homeostasis and Kidneys

Question 1

Which waste products have to be removed from the body?

Answer 1

Urea and Carbon Dioxide

Question 2

How is Carbon Dioxide produced and removed?

Answer 2

Produced: by respiration in every living cell

Removed: via the lungs when we breathe out

Question 3

How is Urea removed and produced and where is it stored?

Answer 3

Produced: in the liver by the breakdown of excess amino acids

Removed: by the kidneys in the urine

Stored: temporarily stoed in the bladded

Question 4

What internal conditions are controlled? (4)

Answer 4

• The water content of the body
• The ion content of the body
• Temperature
  
  • Blood sugar levels

Question 5

What do kidneys do?

Answer 5

They control the water content of the blood and the ion (salt) content of the body

Question 6

How does the kidney receive blood

Answer 6

From the renal artery

Question 7

How does (a healthy) kidney produces urine?

Answer 7

Filtering the blood

1. Blood enters the capillaries under high pressure
2. Mot of the liquid leaves the blood and enters the tubule
3. The cells and large molecules remain in the blood
4. The blood becomes very concentrated

Question 8

What is selective reabsorbtion?

Answer 8

The amount of water and mineral ions that are reabsorbed by the body depending upon its need