circulatory system of a mammal

Question 1

What affects whether organisms have a specialised transport medium and whether it is circulated by a pump?

Answer 1

SA: Volume

activity of organism

Question 2

what are the 4 main features of a transport system

Answer 2

1. medium to carry material (e.g: blood)
2. mechanism to move the medium in the vessels
3. a closed system of vessels to transport the medium to all areas of the body
4. a form of mass transport system to move the medium in bulk

Question 3

explain why large animals have a transport system

Answer 3

large animals have specialised exchange surfaces so transport system is needed to take substances from exchange surfaces to all of the cells in the body

Question 4

describe the pattern of blood circulation in a mammal

Answer 4

closed, double circulatory system (blood passes through the heart twice for every circuit of the body)

deoxygenated blood is pumped from lungs to heart, oxygenated blood flows back to heart and then is pumped around the body