U2.3 Metabolic rate

Question 1

What does a respirometer do?

Answer 1

Measure metabolic rate by ………………..

Question 2

How can metabolic rate be calculated?

Answer 2

By measuring oxygen consumption using an oxygen probe, and by measuring carbon dioxide production using a carbon dioxide probe.
By the production of heat in a calorimeter.

Question 3

Organisms with high metabolic rates require…?

Answer 3

Efficient delivery of oxygen to cells.

Question 4

Put the following in order of decreasing metabolic rate:
Reptiles and amphibians,
Fish,
Birds and mammals.

Answer 4

Birds and mammals,
Reptiles and amphibians,
Fish

Question 5

Describe complete double circulatory system and give an example of an organism that has it.

Answer 5

Two atria and two ventricles- Birds and mammals

Question 6

Describe incomplete double circulatory system and give an example of an organism that has it.

Answer 6

Two atria and one ventricles- Reptiles and amphibians

Question 7

Describe single circulatory system and give an example of an organism that has it.

Answer 7

One atrium and one ventricle- Fish

Question 8

How does having a complete double circulatory system enable higher metabolic rates?

Answer 8

By preventing mixing of oxygenated and deoxygenated blood.

By keeping blood a high pressure allowing efficient oxygen delivery to cells.