Transport systems - Plants and Animals

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  • Created by: Harry
  • Created on: 24-04-14 21:07
What does O2 diffuse at?
0.5 mm/s
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Why do large organisms need transport systems?
Animal cell (e.g) has cells 1mm thick = lower surface area/volume. Therefore need transport systems to supply O2 + sugar to all cells quickly
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What are the two undirectional routes that plants use?
Transpiration and Translocation
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Elaborate on transpiration in leaves?
Water + minerals -> roots -> cytoplasm of spongy mesophyll layer
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Elaborate on translocation in leaves?
Phloem -> sugar -> leaves -> roots
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What is the full process of transpiration in leaves?
1) Water moves from xylem to cytomplasm of spongy mesophyll (OSMOSIS) 2) Water moves between cells (OSMOSIS) 3) Water evaporates from cell surface > air space 4) Water vapour leaves via stomata (DIFFUSION)
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Elaborate on the root hairs in relation to transpiration in leaves?
Root hairs have a larger surface area for H2O absorption 2) H2O moves via OSMOSIS across the cortex 3) HYDROSTATIC PRESSURE pushes water into xylem
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Elaborate on Translocation in leaves?
1) Photosynthesis in leaves produces sugars 2) ACTIVE TRANSPORT moves sugar into phloem 3) ACTIVE TRANSPORT moves sugars from leaves into the roots
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What three types of transport are there in the body?
Arteries, capillaries and veins
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List the cycle of the human transport system.
Heart > Arteries > Artenoles > Capillaries > Venules > Veins > Heart (on loop)
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What are the characteristics of arteries?
2cm thick, muscular/elastic wall, impermeable, high pressure, pulses
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What are the characteristics of capillaries?
1 cell thick, 10th of a mm, low pressure, steady flow
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What are the characteristics of veins?
2cm wide, thin walls, large lumen valves, no pressure, flows due to skeletal contraction
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What are the roles of valves in the heart?
To ensure the ONE WAY flow of blood through the heart.
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What are the steps of pumping blood (chambers)?
Atria contract blood to ventricles, ventricles contract blood to arteries, all chambers relax & refill with blood
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Other cards in this set

Card 2

Front

Why do large organisms need transport systems?

Back

Animal cell (e.g) has cells 1mm thick = lower surface area/volume. Therefore need transport systems to supply O2 + sugar to all cells quickly

Card 3

Front

What are the two undirectional routes that plants use?

Back

Preview of the front of card 3

Card 4

Front

Elaborate on transpiration in leaves?

Back

Preview of the front of card 4

Card 5

Front

Elaborate on translocation in leaves?

Back

Preview of the front of card 5
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