open and closed circulatory systems Flashcards
1
Q
what is single circ system
A
blood passes heart once
eg fish
2
Q
what is double circ system
A
blood passes heart twice
heart has left and right side to deal with oxygenated and deoxygenated
3
Q
advantage double circ
A
blood only has to travel through one capillary network
maintains higher pressure and average speed flow so helps steeper conc gradient and makes exchange more efficient
4
Q
what is open circ system
A
blood not always confined in blood vessels and is in a body cavity
5
Q
what is closed circ system
A
blood always in vessels
6
Q
how is blood transported in insects
A
dorsel vessel delivers haemolymph to the haemocoel by pumping of tubular heart in abdomen
haemolymph baths organ and re enters heart by ostia
