During expiration the air will leave the lungs when the pressure inside the lungs must become

Official answer key: C. The answer shown above (B) is the academy’s own.

Expiration

• The movement of air from the lungs to the outside is influenced by exhalation.
• The process by which carbon dioxide is transported from the lungs' alveoli to the surrounding environment via the alveoli's components is known as expiration.
• When the intra-pulmonary pressure is higher than the atmospheric pressure, exhalation occurs.
• These gradients are made possible by the diaphragm and a specialized set of muscles between the ribs called the external and internal intercostal muscles.
• A healthy person takes in 12 to 16 breaths per minute. A spirometer, which aids in the physical assessment of pulmonary function, can estimate breathing movements.

Additional Information

Inspiration

• The process of breathing is involved in inspiration.
• Moving air from the environment to the lungs of the human body is the process of inhalation.
• In bronchitis, the air travels from the nasal chamber nose to the pharynx before reaching the air pipe. After that, the air reaches the Alveoli, which are tiny sacs of air.
• When the pressure within the lungs is lower than the pressure in the surrounding air, inspiration can occur because the alveoli facilitate the flow of oxygen-rich air to the heart.
• The body contracts the diaphragm during this inspiration phase, bringing it to the lungs.
• The contraction of the diaphragm, which expands the thoracic chamber along the anteroposterior axis, initiates inspiration.
• The inspiration occurs when the intra-pulmonary pressure falls below the atmospheric pressure as a result of an increase in pulmonary volume. This forces air from outside the body into the lungs.