Key Area 3: Metabolic Rate

Question 1

What is metabolic rate?

Answer 1

Metabolic rate is a measure of energy used by an organism over a period of time

Question 2

What are the three ways metabolic rate can be measured?

Answer 2

Oxygen consumption
Carbon dioxide output
Heat production

Question 3

Why do organisms require efficient delivery of oxygen to cells?

Answer 3

?

Question 4

Describe the circulatory system in fish

Answer 4

Single system
1 atrium and 1 ventricle
Blood passes through the heart once
Low efficiency

Question 5

Describe the circulatory system in amphibians and reptiles

Answer 5

Incomplete double system
2 atrium and 1 ventricle
Blood passes through twice but mixes in the ventricle

Question 6

Describe the circulatory system in birds and mammals

Answer 6

Complete double system
2 atrium and 2 ventricle
Blood passes through twice
Highest efficiency

Question 7

Describe the lung complexity of amphibians

Answer 7

Small, thin walled, has exchange through moist skin, few alveoli

Question 8

Describe lung complexity of mammals and reptiles

Answer 8

Larger, thin walled with mucus to stop dirt getting to the lungs, lots of alveoli

Question 9

Describe the lung complexity of birds

Answer 9

Extra air sacs to keep up with oxygen demand

Parabronchi to keep air flowing in one direction