3.2- transport in animals Flashcards
1
Q
definition of double circulatory system
A
the blood flows through the heart twice for each circuit of the body.
2
Q
single circulatory system
A
blood flows through the heart once for each circuit of the body.
3
Q
name the 5 features of an effective transport system.
A
- a fluid or medium- to carry nutrients.
- pump for pressure.
- exchange surfaces.
- tubes or vessels to carry blood.
- 2 circuits
4
Q
how can the blood flow more quickly ?
A
by increasing the pressure
5
Q
features of a single circulatory system of fish.
A
- blood pressure drops as blood passes through the tiny capillaries of the gills.
- blood has a low pressure as it flows towards the body and will not flow very quickly.
6
Q
advantages of a double circulation system
A
- blood pressure must not be to high otherwise it will damage the delicate capillaries.
- heart can increase the pressure of the blood at a higher pressure
7
Q
why do fish require less energy compared to mammals
A
they are not metabolically active like mammals and they do not maintain their body temprature.
