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Fish & respiration

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Fish & respiration

Postby Aerlinn » Tue Nov 15, 2005 9:22 am

1) On this question, it says: Organisms must obtain oxygen from their surroundings. Fish obtain oxygen by means of gills. Oxygen dissolved in the outside water moves through the gill membranes. Why do organisms need to take in oxygen?

3) In fish, the blood, after leaving the heart, passes through the capillaries in the gills and then moves onto the rest of the body before returning to the heart.
Explain how this is different from the passage of blood flow in mammals such as humans.
Explain how this would affect the rate of blood flow in the body of a fish compared to the rate of blood flow in a mammal.

4) And the last one... Why does the breakdown of the alveoli wall leave the patient struggling for breath?

Can anyone help with these? :)
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Postby Navin » Tue Nov 15, 2005 9:54 am

4. When the alveolar walls break down large empty spaces called emphysema are formed. This greatly reduces the surface area of the lungs for the absorption of oxygen. Also the lungs may lose its elasticity.
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Postby MrMistery » Tue Nov 15, 2005 8:55 pm

1.oxidation
3.pressure

Look up those words and you will have your answers
By the way, where is 2?
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Postby Aerlinn » Wed Nov 16, 2005 5:19 am

Oops, that was a mistake. There's only 3 of them ^^

I looked them up in the dictionary here, and they didnt say much... :(
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Postby MrMistery » Wed Nov 16, 2005 6:54 pm

I meant look them up in a zoology book. i don't doubt you know what they mean
1. For oxidative phosphorilation and Krebs cycle.
2. the pressure is lost in the guils
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