unit 3; Exchange between organisms and their environment Flashcards
1
Q
define- tissue fluid
A
the environment around the cells of multicellular organisms
2
Q
things that need to be exchanged between an organism and its environment
A
heat, respiratory gases, nutrients and excretory products
3
Q
sa:v ratio
A
smaller for larger animals- larger sa:v ratio means longer diffusion pathway
4
Q
exchange surfaces adaptations
A
large sa relative to the volume of the organism, very thin- short diffusion pathway, selectively permeable- allow only selected materials to cross
5
Q
A
