smaller organisms have higher SA:V which means lose heat quicker
1 of 11
Whats the gas echange in single-celled and multicellular organisms?
single=diffusion across membrane, multi=low SA:V so difficult to exchange enough for the large vol, exchange organs and 'mass transport' to indivdual cells
2 of 11
Explain the gas exchange of fish
fish-water passes over gills, made of gill filaments, covered in lamella with blood capilaries (increase surface area) counter-current system- water with high O2 next to low, maintain gradient,
3 of 11
How does an insect exchange gas?
air into trancheae, pores called spiracles, branches to tracheols into cells directly rhythmic abdominal movements, move air in and out spiracles
4 of 11
What controls gas exchange in plants? how are some adapted to reduce water loss?
guard cells (flaccid or turgid), control open/close of stomata, xerophytes-hairs to trap water vapour, curled leaves with stomata inside to protect it from wind
5 of 11
What vessles are involved in the circulatory system?
pulmonary artery- H to L, pulmonary vein-L to H, aorta-H to B, hepatic artery-B to L, hepatic vein-L to VC, hepatic portal vein-G to L, renal artery-B to K, renal vein-K to VC
6 of 11
What is tissue fluid?
fluid that surronds cell, made of substances that have left blood (out of capliaries by pressure filteration, re-enter at vein end) used by cells, excess drained into lymphatic system back to circulatory s
7 of 11
Where does water enter a plant?
roots, covered in root hairs to increase surface area, water poteintial gradient
8 of 11
What are the 2 pathways for water through the root?
1. symplast-through cytoplasms, conneted through plasmodesmata, 2. apoplast-cell walls by diffusion, casparian ***** blocks so goes to symplast pathway to xylem
9 of 11
How does water move up a plant?
cohesion and tension and root pressure
10 of 11
What factors affect transpiration? how is it measured?
temperature, light-stomata open in light, humdity-dry=wp gradient increased & wind, measure- potometer measure water uptake, record distance bubble moves
11 of 11
Other cards in this set
Card 2
Front
Whats the gas echange in single-celled and multicellular organisms?
Back
single=diffusion across membrane, multi=low SA:V so difficult to exchange enough for the large vol, exchange organs and 'mass transport' to indivdual cells
Card 3
Front
Explain the gas exchange of fish
Back
Card 4
Front
How does an insect exchange gas?
Back
Card 5
Front
What controls gas exchange in plants? how are some adapted to reduce water loss?
Comments
No comments have yet been made