animal heart and circulation

1.1 on the spec

how does a double circulatory system work

1. vena cava- receives deoxygenated blood from the body

2. right atrium contracts

3. right ventricle contracts

4. pulmonary artery takes deoxygenated blood to the lungs

5. blood gets oxygenated in the lungs

6. pumonary vein carries blood from lungs to heart

7. left atrium contracts

8. left ventricle contracts

9. aorta carries blood away from the heart to the body

10. tissues and cells exchange gases and nutrients

what does the pulmonary artery do

transports deoxygenated blood to the lungs

what does the pulmonary vein do

transports oxygenated blood to the heart

what does aorta do

transports oxygenated blood from the heart to the body

what does the vena cava do

transports deoxygenated blood to heart

whats the advantages of a closed circulatory system

its efficient at transporting substances quickly at high pressure

what are the advantages of open circulatory system

it requires less energy for distribution

regulated body temperature better

no blood pressure means blood moves slowly

what are the disadvantages of an open circulatory system

not suitable for large animals - low pressure

blood distribution cant change

explain why a snake needs a heart

• to pump blood to body cells

• by mass transport

• because it’s surface area to volume ratio does not allow diffusion to occur at a sufficient rate