Exchange and transport

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  • Created by: Sopha8
  • Created on: 31-05-14 10:34
Explain about surface area:volume ratio
smaller organisms have higher SA:V which means lose heat quicker
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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
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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,
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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
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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
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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
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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
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Where does water enter a plant?
roots, covered in root hairs to increase surface area, water poteintial gradient
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What are the 2 pathways for water through the root?
1. symplast-through cytoplasms, conneted through plasmodesmata, 2. apoplast-cell walls by diffusion, casparian strip blocks so goes to symplast pathway to xylem
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How does water move up a plant?
cohesion and tension and root pressure
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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
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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

Preview of the front of card 3

Card 4

Front

How does an insect exchange gas?

Back

Preview of the front of card 4

Card 5

Front

What controls gas exchange in plants? how are some adapted to reduce water loss?

Back

Preview of the front of card 5
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