During what activity is the diaphragm's central tendon pulled inferiorly?

During what activity is the diaphragm's central tendon pulled inferiorly?

• A. Inhalation
• B. Exhalation
• C. Coughing
• D. Sneezing

Answer: (A)

Breathing relies on the diaphragm changing the size of the chest cavity. The diaphragm is a dome-shaped muscle with a central tendon. When the diaphragm contracts, its muscle fibers pull the central tendon downward into the abdomen, flattening the diaphragm. This downward pull increases the vertical dimension of the thoracic cavity, lowers intrathoracic pressure, and pulls air into the lungs—so the central tendon is pulled inferiorly during inhalation. When you exhale, the diaphragm relaxes and the central tendon moves back up as the diaphragm returns to its dome shape, reducing thoracic volume and helping push air out. Coughing or sneezing involves forced expiration and uses additional muscles, but the specific downward pull of the central tendon occurs with diaphragmatic contraction in inhalation.

Breathing relies on the diaphragm changing the size of the chest cavity. The diaphragm is a dome-shaped muscle with a central tendon. When the diaphragm contracts, its muscle fibers pull the central tendon downward into the abdomen, flattening the diaphragm. This downward pull increases the vertical dimension of the thoracic cavity, lowers intrathoracic pressure, and pulls air into the lungs—so the central tendon is pulled inferiorly during inhalation.

When you exhale, the diaphragm relaxes and the central tendon moves back up as the diaphragm returns to its dome shape, reducing thoracic volume and helping push air out. Coughing or sneezing involves forced expiration and uses additional muscles, but the specific downward pull of the central tendon occurs with diaphragmatic contraction in inhalation.