8.1

Question 1

what is an open circulatory system?

Answer 1

when blood is pumped to and from the heart without vessels acting as a transport medium

Question 2

what is a closed circulatory system?

Answer 2

when blood is pumped to and from the heart within vessels which act as a transport medium

Question 3

what is a single circulatory system?

Answer 3

when blood is pumped through the heart only once in each circulation of the body

Question 4

what is a double circulatory system?

Answer 4

when blood is pumped through the heart twice in each circulation of the body

Question 5

what are the advantages of a closed double circulatory system?

Answer 5

blood is pumped at a high pressure
fast flow of blood can be maintained

Question 6

why do animals need a transport system?

Answer 6

have a low SA:V ratio
long diffusion distances
high metabollic rate
extremely active thus needs a cosntant supply of ocygen