circulatory systems

Question 1

what happens in an open circulatory system

Answer 1

• heart pumps the blood into spaces, called haemocoel
• the tissue bathe in the blood directly and exchange of materials takes place
• blood flows slowly back into the heart
• movement of muscles and valves allows assist with the movement of blood back into the heart region
• in insects there is no respiratory pigments

Question 2

what happens in a closed circulatory system

Answer 2

• the blood is transported in tubes called blood vessels
• blood is pumped by the heart at high pressure resulting in rapid flow
• tissues are not in direct contact with the blood, they bathe in tissue fluid
• the blood contains a respiratory pigment

Question 3

what are the advantages of a closed circulatory system

Answer 3

• the blood flow is more rapid and efficient
• it can be directed where it is needed by constriction or relaxation

Question 4

what are the types of closed circulatory systems

Answer 4

• single = blood from anywhere in the body pass through the heat only once
• double = the blood in the body can pass through the heart twice

Question 5

explain a single circulatory system

Answer 5

• the blood pressure is reduced
• the blood flow around the body is not very quick
• the rate of delivery of oxygen and nutrients is limited