Home › NEET UG › biology › Breathing and Exchange of Gases › During quiet inspiration, the diaphragm
During quiet inspiration, the diaphragm
Adomes upward into the thorax
Bflattens downward, increasing thoracic volume
Cstays still; only ribs move
Dmoves laterally outward
Answer & Solution
Correct answer: B. flattens downward, increasing thoracic volume
The diaphragm is a muscular dome. Contraction flattens it, pulling downward, expanding the thoracic cavity → pressure drops → air flows in. Relaxation domes it back up → air flows out.
Related questions
Carbon monoxide poisoning is dangerous because COEmphysema is most commonly caused byThe basic respiratory rhythm is generated in theThe Bohr effect refers to the shift of the O₂-Hb dissociation curve to the RIGHT whenMost CO₂ is transported in the blood asOne haemoglobin molecule can carry a maximum of how many oxygen molecules?Surfactant in the alveoliResidual volume (RV) is