Question

During inhalation and exhalation which of the following is seen

• A. Ribs move up and outward, diaphragm moves down
• B. Ribs move down and inwards, diaphragm moves up
• C. Ribs move down and outwards, diaphragm moves down
• D. Ribs move up and inwards, diaphragm moves down

Answer 1

Answer: (A), (B)

The correct options are
A Ribs move up and outward, diaphragm moves down
B Ribs move down and inwards, diaphragm moves up

During inhalation, the external intercostal muscles contract and lifts ribs outward, while diaphragm become flat and moves down thereby increases the volume of thoracic cavity.

During exhalation, the external intercostal muscles return the diaphragm and ribs to their normal thoracic volume. Ribs moves down and inwards while diaphragm moves up.

So the correct answer is Both A and B'.