Unit 2 Key area 3

Question 1

State three ways that we can measure metabolic rate?

Answer 1

• Carbon dioxide production
• Heat production
• Oxygen consumption

Question 2

Give examples of apparatus that can be used to measure the rate of respiration?

Answer 2

• Carbon dioxide probes
• Oxygen probes
• Calerometers
• Respirometers

Question 3

What can be said about organisms that have high metabolic rates?

Answer 3

Organisms that have high metabolic rates require more efficient oxygen delivery to cells

Question 4

Order Birds, Amphibians, Reptiles, Mammals, Fish, and reptiles in highest to lowest metabolic rates?

Answer 4

Birds/Mammals, Amphibians/ Reptiles, Fish

Question 5

Describe the structure of a Mammal/ Bird heart?

Answer 5

A mammal/ Bird heart will have a complete double circulatory system, consisting of two atria and two ventricles.

Question 6

Describe the structure of a reptile/ amphibian heart?

Answer 6

A reptile/ amphibian heart has an incomplete double circulatory system consisting of two atria and a single ventricle.

Question 7

Describe the structure of a Fish heart?

Answer 7

Fish have a singular circulatory system consisting of an atria and a ventricle.

Question 8

What are the advantages of having a complete double circulatory system?

Answer 8

• Higher metabolic rates can be maintained
• No mixing of oxygenated and deoxygenated blood
• Blood can be pumped out at higher pressures enabling more efficient oxygen delivery to cells