Key Area 2.3: Metabolic rate

Question 1

What is metabolic rate?

Answer 1

The metabolic rate of an organism is the amount of energy used in a period of time, it can also be measured in terms of the oxygen consumed, carbon dioxide produced or heat produced.

Question 2

What is a single circulatory system?

Answer 2

Single circulatory systems can be found in fishes. Single circulatory systems are made up of two chambers-atrium and ventricle. the blood only passes through the heart once every circuit.

Question 3

Make a table of the Circulatory systems in vertebrates?

Answer 3

…

Question 4

What is a incomplete Double circulatory system?

Answer 4

These systems are found in amphibians and most reptiles. their hearts have 3 chambers, two atrium and one ventricle. the right atrium receives the de-oxygenated blood which is coming back from the capillary beds in body tissues. The left atrium then receives oxygenated blood from the lungs. the oxygenated blood and de-oxygenated blood mix before being sent out to the body tissues that require it.

Question 5

What is a complete Double circulatory system

Answer 5

These systems are found in birds and mammals, here the heart has 4 chambers, 2 atria and 2 ventricle, this means the de-oxygenated and oxygenated blood does not mix.