How can the strength of inspiration and expiration be increased?

How can the strength of inspiration and expiration be increased?
  1. By using a spirometer
  2. By decreasing the volume of air involved
  3. By using additional muscles in the abdomen
  4. By increasing the volume of air involved

Solution

The strength of inspiration and expiration can be increased with the help of additional muscles in the abdomen.

Asked in: NCERT

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