What properties to the alveoli and the villi have that makes them ideal for gas exchange?
Large surface area, Good blood supply, Moist, thin (so small diffusion distance)
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What is osmosis?
the passive movement of water molecules from an area of high water concentration to an area of lower water concentration across a partially permeable membrane
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How do most mineral ions and water enter the plant?
absorbption by the root hair cells
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In plants how does carbon dioxide enter the leaf?
by diffusion
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What do the guard cells do?
they control the size of the stomata, if plants lose water faster than the roots can replace it, the stomata can close to prevent wilting
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What conditions is transpiration most rapid in?
Hot, dry and windy conditions
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Do the veins carry the blood away from or towards the heart?
towards the heart
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Do the arteries carry the blood away from or to the heart?
away from the heart
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What does active transport allow cells to do?
Absorb ions from very dilute solutions
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How do substances produced by the cells leave the cells?
substances produced by the cells pass into the blood through the walls of the capillaries
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Other cards in this set
Card 2
Front
What is osmosis?
Back
the passive movement of water molecules from an area of high water concentration to an area of lower water concentration across a partially permeable membrane
Card 3
Front
How do most mineral ions and water enter the plant?
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