U2 KA3

Question 1

What is an organisms Metabolic Rate?

Answer 1

• the rate at which glucose is broken down into ATP, CO2 and water during respiration.

Question 2

How do you measure metabolic rate? (3)

Answer 2

• Oxygen Consumption (Respirometer).
• CO2 Production.
• Heat production (Calorimeter).

Question 3

What is the role of an artery?

Answer 3

• they carry high pressure blood away from the heart.
• muscular vessels.

Question 4

What is the role of a vein?

Answer 4

• to carry low pressure blood towards the heart.
• thin walled with valves to prevent the back flow of blood.

Question 5

How does blood pressure in the artery affect the rate of oxygen transfer?

Answer 5

• the higher the blood pressure in the artery, the faster the oxygen can be delivered to respiring body cells.

Question 6

What is the structure of Mammal are Bird hearts?

Answer 6

• a complete double circulatory system, with 2 atrium and ventricles.
• blood is pumped at a high pressure to maintain a high metabolic rate.

Question 7

What is the structure of Amphibian and Reptile hearts?

Answer 7

• an incomplete double circulatory system, with 2 atrium and 1 ventricle.
• there is a mixing of oxygenated and deoxygenated blood.
• blood is pumped at a medium pressure to maintain a medium metabolic rate.

Question 8

What is the structure of a fish heart?

Answer 8

• a single circulatory system, with 1 atrium and ventricle.
• blood is pumped at low pressure and the metabolic rate is low.