1. Exchange and transport
Transport in mammals
We are learning to…
Explain the need for transport systems in
multicellular organisms in terms of size, activity and
SA:Vol
Describe and explain the terms ‘single and double
circulation’ and ‘open and closed circulatory
systems’
6. Comparison
Single Double
Pulmonary and systemic
circulations in series
Pulmonary and systemic
circulations in 8 loop
Low activity/
Ectothermic
High activity/
Endothermic
Limited rate of
transport to tissues
Higher rate of
transport to tissues
8. Open v Closed Circulatory
Systems
Open Circulatory System Closed circulatory system
Heart pumps into open cavities, blood
vessels carry blood to all parts of the
body
Blood remains within a network of
vessels and does not leave
Has no arteries to increase BP,
therefore has more blood at low
pressure
Carries blood at high pressure and
delivers blood quickly.
Requires less energy for distributing
blood
Suitable for animals with a fast
metabolism
Better for animals with a small body
and slow metabolism because less
active animals with a low metabolism
do not require high amounts of oxygen
The animal is able to move, digest and
eliminate waste quickly
