Question

state reason: 1.Why does not collapse when it has insufficient air.
2. haemoglobin is present in RBC in humans.

Answer 1

trachea doesn't collapse because of rings inside of trachea take a eg of straw which doesn't has rings it collapse.
haemoglobin gives the colour of blood.

Answer 2

Answer:

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Explanation:

(1) Trachea is supported by c-shaped rings of cartilage which hold them in place when there is less air inside it. So, the walls of trachea do not collapse even when there is a little air.

(2) Haemoglobin is the protein inside red blood cells. It carries oxygen. Red blood cells also remove carbon dioxide from your body, transporting it to the lungs for you to exhale.