Practice Questions

Question 1

List two features of human gas exchange surfaces.

Answer 1

1. They are very wrinkly, so as to increase surface area.

2. They are very thin, so they’re permeable.

Question 2

Describe a chemical test that would identify the gas excreted through the lungs as carbon dioxide.

Answer 2

The chemical test for this is: A lighted wooden splint being put into a test tube of hydrogen.

The positive test result for this is: There will be a squeaky popping sound in the presence of hydrogen.