Exchanging Materials

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  • Created by: Lotto65
  • Created on: 21-12-15 14:39
What is the surface area: volume ratio of small organisms?
Large
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How do single-celled organisms gain necessary materials?
By diffusion through the surface as they are so tiny
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Why is it necessary to exchange materials?
So oxygen and soluble food can reach cells for respiration and waste materials can leave efficiently
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What surface area:volume ration do large organisms have?
Small- decreases as the organism increases in size
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Why do organisms with many cells need exchange surfaces?
Many cells are not in contact with the environment so they need these surfaces to obtain all the oxygen and materials they need
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What are the general characteristics of exchange surfaces?
Thin walls; Efficient transport system; LARGE SURFACE AREA
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What is the requirement for gaseous exchange surfaces?
Must be ventilated
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What is the gaseous exchange surface called in our lungs?
Alveoli
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What are the characteristics of alveoli?
Thin walls; large surface area; good blood supply nearby
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Why is it important for the alveoli to have a good blood supply nearby?
To maintain a concentration gradient
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Give two adaptations of plants to allow maximum absorption
Long, thin roots to increase surface area+ root hair cells; Broad leaves
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What are the characteristics of leaves to allow gas exchange?
Flat; thin; Internal air spaces; stomata to allow gases in and out
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Where in the digestive system are solutes absorbed into the blood?
Small intestine
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What lines the inner surfaces of the small intestine?
Villi
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What is the purpose of villi?
An exchange surface for food
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What are some characteristics of villi?
Thin walls (1 cell thick); capillaries close by; finger shape increases surface area
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Why is it good for villi to have thin walls?
Short diffusion path
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Why is it good for villi to have many capillaries nearby?
Rich blood supply to maintain steep concentration gradient
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Why is it important for the villi to have a large surface area?
Greater rate of diffusion etc. so the most amount of solutes can be absorbed
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How are solutes absorbed into the blood through the villi?
Diffusion or active transport
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Other cards in this set

Card 2

Front

How do single-celled organisms gain necessary materials?

Back

By diffusion through the surface as they are so tiny

Card 3

Front

Why is it necessary to exchange materials?

Back

Preview of the front of card 3

Card 4

Front

What surface area:volume ration do large organisms have?

Back

Preview of the front of card 4

Card 5

Front

Why do organisms with many cells need exchange surfaces?

Back

Preview of the front of card 5
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