Multiple choice

Which of the following is not a function of the lungs?

  1. Secreting immunoglobulin A

  2. Maintaining sterility of the body

  3. Filtering small blood clots formed in the arteries

  4. Forming a defence system against air-borne infection

  5. Serving as a reservoir of blood in the body
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lungs filter gas micro-bubbles occurring in the venous blood stream such as those created during decompression after underwater diving. They also filter out small blood clots formed in the veins.

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