Which of the following respiratory systems is not closely associa...

Question

Which of the following respiratory systems is not closely associated with a blood supply?
a. the lungs of a vertebrate
b. the gills of a fish
c. the tracheal system of an insect
d. the skin of an earthworm

Accepted Answer

Welcome back. Let's look at our next question, What do of vertebrates, lungs and officious gills have in common. Well first let's just kind of quickly recall those two things, lungs and gills. We recall that they're part of the respiratory system. So that system for uh taking in oxygen and excreting carbon dioxide with that in mind. Let's look at our four choices. As we look them over, we note that choice D. Is all of the above. So there's a possibility that all the answers will be correct. So let's look at choice A choice A says both help to breathe oxygen dissolved in water. Well this is correct of gills but lungs extract oxygen from the gasses air not water. So A. Is not correct. That also lets us eliminate D. Since we now know that not all the answers are correct. So let's look at choice B. B. Is diffusion of excretory products while lungs and gills are part of the respiratory system, diffusion of excretory products as part of the excretory system. That is its function so we can eliminate choice B. So we're left with choice see rich blood supply. And that is correct. Since you are oxygenating the blood and then allowing carbon dioxide to diffuse out of the blood. You need a rich blood supply running through those organs to make those functions happen. So choice C. Rich blood supply is something lungs and gills have in common. So that was a pretty straightforward one. We'll see you in the next video

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