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NEETZoologyBreathing and Exchange of Gases

Muscle Action A. Diaphragm 1. Depresses the ribs during forced expiration B. External Intercostals 2. Assists in forced expiration C. Internal Intercostals 3. Contracts and flattens during inspiration D. Abdominal Muscles 4. Elevates the ribs during inspiration

Options

  1. AA-4;B-3;C-1;D-2
  2. BA-3;B-4;C-1;D-2
  3. CA-3;B-1;C-4;D-2
  4. DA-3;B-4;C-2;D-1

Correct answer

B. A-3;B-4;C-1;D-2

Step-by-step solution

The diaphragm contracts and flattens during inspiration. External intercostals elevate the ribs during inspiration. Internal intercostals depress the ribs during forced expiration. Abdominal muscles assist in forced expiration.

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