2.3 Metabolic Rate

Question 1

Define ‘Metabolic Rate’

Answer 1

The metabolic rate of an organism gives an indication of the total of all the chemical reactions occurring at any one time, it is the sum of the bodies metabolic pathways

Question 2

What three things can be used to measure metabolic rate?

Answer 2

Oxygen consumption
Carbon Dioxide output
Heat energy output

Question 3

Describe a ‘Respirometer’

Answer 3

Sealed unit with a known volume of air
Contains NaOH to absorb Co2
Organism breathes and uses up oxygen, and releases Co2
Total volume of air decreases
Coloured liquid in capillary tube moves upwards to fill space

Question 4

How can Oxygen consumption be measured?

Answer 4

Respirometer OR oxygen probe

Question 5

How can Carbon Dioxide Output be monitored?

Answer 5

CO2 monitors

Question 6

How can heat energy be monitored?

Answer 6

Thermometer

Question 7

What does high metabolic rate require?

Answer 7

Efficient delivery of Oxygen to cells

Question 8

Describe the circulatory systems of mammals

Answer 8

Complete Double

Question 9

Describe the heart structure of fish

Answer 9

1 atrium, 1 ventricle

Question 10

Describe the circulatory system of amphibians

Answer 10

Incomplete Double

Question 11

Describe the heart structure of reptiles

Answer 11

2 atrium

1 ventricle

Question 12

Describe the circulatory system of fish

Answer 12

Complete Single

Question 13

Describe the heart structure of mammals and birds

Answer 13

2 atria, 2 ventricles

Question 14

Describe a disadvantage of the fish circulation system

Answer 14

Loss of pressure as blood passes through gills

Question 15

Describe a feature of reptile and amphibian circulation

Answer 15

Mixing of oxygenated and deoxygenated blood

Question 16

What are two advantages of the mammal circulation system?

Answer 16

• Pressure is maintained

- No mixing of different types of bloods