Biology Topic 8

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Carbon dioxide is a waste product of what process?
aerobic respiration
1 of 17
What does Urea diffuse into from the cells?
blood plasma
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Why in single-celled organisms, can gases and dissolved substances diffuse directly across the cell membrane?
because it has a large surface area to volume, some enough substance can be exchanged across the membrane to supply for the volume of the cell
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Multi-cellular organisms have a....
smaller surface are compared to their volume
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What is the alveoli?
exchange surface found in the lungs
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What three factors effect the rate of diffusion?
Distance, Concentration Difference and Surface Area
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What is the job of the lungs?
to transfer oxygen to the blood and remove waste carbon dioxide
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In the alveoli there is a high concentration of what gas?
oxygen
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Name two adaptations of the alveoli
very thin walls to minimise diffusion distance,enormous surface area,moist lining for dissolving gases
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In fick's law the rate of diffusion is proportional to what?
the surface area x conc difference divided by the thickness of the membrane
10 of 17
What is another name for a red blood cell?
erythrocyte
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What is the job of a red blood cell?
to carry oxygen from the lungs to the cells in the body
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Name two adaptations of a red blood cell
no nucleus more room for oxygen, biconcave shape to increase surface are
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Name the two types of white blood cells
phagocyte and lymphocyte
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What does a phagocyte do?
changes shape to engulf unwelcome microorganisms
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What does a lymphocyte do?
produces antibodies and antitoxins
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What do platelets do?
help blood clot at a wound, stops blood pouring out and microorganisms getting in
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Other cards in this set

Card 2

Front

What does Urea diffuse into from the cells?

Back

blood plasma

Card 3

Front

Why in single-celled organisms, can gases and dissolved substances diffuse directly across the cell membrane?

Back

Preview of the front of card 3

Card 4

Front

Multi-cellular organisms have a....

Back

Preview of the front of card 4

Card 5

Front

What is the alveoli?

Back

Preview of the front of card 5
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