3.1.2b) The different types of circulatory systems

Question 1

Single circulatory system

Answer 1

Blood only passes through the heart once complete circuit of the body
Limits the efficiency of the exchange process so the activity levels of animals with this circulatory systems

Question 2

Double circulatory system

Answer 2

Blood travels twice through the heart for each circuit of the body
Each circuit only passes through 1 capillary network
High pressure & fast flow of blood can be maintained

Question 3

Open circulatory system

Answer 3

From the heart into the body cavity
Haemocoel - open body cavity
Transport medium is under low pressure & comes into direct contact with tissues & cells

Question 4

Closed circulatory system

Answer 4

Blood is enclosed in blood vessels & doesn’t come into contact with body cells
Heart pumps blood around the body under pressure & relatively quickly & returns quickly to the heart substances leave & enter the blood through the walls of the blood vessels
Amount of blood flowing can be adjusted by widening or narrowing blood vessels
Most contain a blood pigment that carries respiratory gases