Unit 3

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Active transport requires what?
Energy.
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Where does active transport move molecules?
Against the concentration gradient.
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Where does the energy needed for active transport come from?
Cell respiration.
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Why is active transport used by root cells?
To absorb minerals, like nitrates, from dilute concentrations in soil.
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What transports molecules from surroundings into the cell?
Special proteins in the cell membrane.
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Where does cell respiration occur?
In the mitochondria.
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What happens in cell respiration?
Glucose is broken down and combined with oxygen to release energy.
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What do cells that do a lot of active transport have lot of?
Mitochondria.
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Where do root hair cells absorb oxygen from?
Air spaces in the soil.
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What are exchange surfaces used for?
Taking in substances from surroundings and getting rid of other substances.
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Where are exchange surfaces found?
In the lungs, intestines and kidneys.
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Why does the small intestine have villi?
To absorb nutrients from food into the blood.
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Why do the lungs have alveoli?
To absorb oxygen from the air and release carbon dioxide from the blood.
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Why do the kidneys have nephrons?
To get rid of urea from the blood.
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What does villi have?
A large surface area.
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Which exchange surface has a small distance for diffusion?
Flattened cells in the alveoli.
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What does blood get pumped through to maintain a concentration gradient?
Through nephrons in the kidneys.
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How does villi adapt the small intestine?
It folds in intestine lining which increases surface area.
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Why is there a small distance for diffusion in the small intestine?
The small intestine has thin walls.
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How does the small intestine maintain the concentration gradient?
It has a dense network of blood capillaries to move the nutrients away.
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Other cards in this set

Card 2

Front

Where does active transport move molecules?

Back

Against the concentration gradient.

Card 3

Front

Where does the energy needed for active transport come from?

Back

Preview of the front of card 3

Card 4

Front

Why is active transport used by root cells?

Back

Preview of the front of card 4

Card 5

Front

What transports molecules from surroundings into the cell?

Back

Preview of the front of card 5
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