Unit 2.3 metabolic rate

Question 1

What are the ways in which we can measure metabolic rate?

Answer 1

• Respirometer
• Oxygen probes
• Carbon dioxide probes
• Calerometers

Question 2

Name each in order of lowest to highest metabolic rate birds, fish, reptiles, mammals, amphibians?

Answer 2

fish, reptiles/amphibians, birds/mammals

Question 3

What is the structure of a bird’s heart like?

Answer 3

Birds have complete double circulatory systems, consisting of two atria, and two ventricles.

Question 4

What is the structure of Amphibians and most reptiles hearts?

Answer 4

amphibians and most reptiles have an incomplete double circulatory system consisting of two atria and a single ventricle.

Question 5

What is the structure of a Fish heart?

Answer 5

Fish have a single circulatory system and have a single atria and ventricle

Question 6

What are the benefits of a complete double circulatory system?

Answer 6

Complete double circulatory systems
- enable higher metabolic rates to be maintained
- ensures there is no mixing of oxygenated and deoxygenated blood
- Oxygenated blood can be pumped out at higher pressures allowing for more efficient oxygen delivery to cells