reasons for transport system Flashcards
1
Q
why do small orgs not need circ system
A
large SA relation volume
rely diffusion
2
Q
3 issue large orgs face
A
too big for diffusion to supply
SA:V decreases with size
more active so greater demand oxygen
3
Q
what is massflow
A
how substances transported in animal circ system
bulk transport
all materials swept along in blood
