key area 2.3 - metabolic rate Flashcards
1
Q
atrium
A
- heart chamber which receives blood from capillary beds
2
Q
capillary bed
A
- region of the body containing a network of tiny blood vessels that allow exchange of gas, water and nutrients
3
Q
metabolic rate
A
- the amount of energy used in a given period of time by an organism
- measured in terms of oxygen consumption, carbon dioxide production, or heat production her unit time
4
Q
respirometer
A
- measure oxygen consumption
5
Q
calorimeters
A
- can directly measure the heat produced by an organism over a period of time
6
Q
probes
A
- sensor used to measure changes in factors such as temperature in a respirometer
7
Q
single circulatory system
A
- two chambers (one ventricle, one atrium)
- blood passes through heart once in each complete circuit
- blood delivered to capillaries at low pressure
- primitive
- eg in fish
8
Q
incomplete double circulatory system
A
- 3 heart chambers (2 atrium, 1 ventricle)
- since only one ventricle, oxygenated blood and deoxygenated blood mix
- less efficient as blood is not fully oxygenated when being delivered to tissue
- blood passes through heart twice each circuit so high pressure
- amphibians and reptiles
9
Q
complete double circulatory system
A
- 4 chambers (2 atrium, 2 ventricles)
- allows complete separation of oxygenated and deoxygenated blood so no mixing
- efficient as blood is fully oxygenated
- passes through heart twice each complete circuit so kept at high pressure
- birds and mammals
10
Q
ventricle
A
- heart chamber which pumps blood out of the heart to capillary beds
