Step 1: Understanding Inhalation:
Inhalation is the act of breathing air into the body. This requires the lungs to expand, a process driven by the movement of the ribs and diaphragm.
Step 2: Rib Movement During Inhalation:
Intercostal muscles, located between the ribs, contract during inhalation. This contraction elevates the ribs upwards and outwards, thereby expanding the thoracic cavity and accommodating lung expansion.
Step 3: Diaphragm Movement During Inhalation:
The diaphragm, a major muscle separating the chest and abdominal cavities, contracts and flattens downwards during inhalation. This action further enlarges the thoracic cavity, enabling the lungs to expand and draw in air.
Step 4: Summary:
Inhalation involves the upward movement of the ribs and the flattening of the diaphragm. These combined actions increase chest volume, allowing the lungs to fill with air.
Correct Answer: Elevated ribs and a flattened diaphragm.
| List - I | List – II | ||
| A. | Residual Volume | i. | Maximum volume of air that can be breathed in after forced expiration |
| B. | Vital Capacity | ii. | Volume of air inspired or expired during normal respiration |
| C. | Expiratory Capacity | iii. | Volume of air remaining in lungs after forcible expiration |
| D. | Tidal Volume | iv. | Total volume of air expired after normal inspiration |