The need for transport systems

Question 1

Why do humans require transport systems?

Answer 1

-they are complex, large, multicellular organisms
-have a larger diffusion distance to some cells deep in the body

Question 2

3 factors that affect whether an organism needs a transport system

Answer 2

-small SA:volume ratio
-size
-metabolism

Question 3

5 features of transport system that makes it effective

Answer 3

-a pump
-fluid
-exchange surfaces
-vessels
-2 circuits of the body

Question 4

How does a pump make it efficient?

Answer 4

heart generates hydrostatic pressure that pumps blood around the body

Question 5

How does fluid make it efficient?

Answer 5

acts as a transport medium so blood can move

Question 6

How do exchange surfaces make it efficient?

Answer 6

-short diffusion pathways

Question 7

How do vessels make it efficient?

Answer 7

sort out oxygenated and deoxygenated blood, and maintain hydrostatic pressure by containing blood flow

Question 8

How do 2 circuits make it efficient?

Answer 8

-carry both oxygenated and deoxygenated blood
-different pressures in 2 circuits as they have to travel different distances