Multiple choice

The dome-shaped muscle that helps in the breathing process is known as

  1. nostril

  2. diaphragm

  3. alveolus

  4. lung
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Breathing begins with a dome-shaped muscle located at the bottom of the lungs which is known as diaphragm. When we breathe in, the diaphragm contracts and flattens out and pulls downward. Due to this movement the space in the lungs increases and pulls air into the lungs. When we breathe out, the diaphragm expands and reduces the amount of space for the lungs and forces air out.

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