Thoracic Cavity & Lung Volume Changes — NEET Biology
📚 Practice ConceptThe lungs are situated in the thoracic chamber which is anatomically an air-tight chamber. The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs and on the lower side by the dome-shaped diaphragm. The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung (pulmonary) cavity. Such an arrangement is essential for breathing, as we cannot directly alter the pulmonary volume.
Select the INCORRECT statement regarding the human respiratory system. S1: The trachea divides into primary bronchi at the level of the fifth thoracic vertebra. S2: The inner pleural membrane is in close contact with the lung surface, reducing friction between the lung and the thoracic cavity. S3: Cartilaginous rings are present in the trachea and bronchi, but not in the initial or terminal bronchioles. S4: The exchange part of the respiratory system is responsible for clearing air from foreign particles and humidifying it. S5: The thoracic chamber is an anatomically air-tight chamber, formed dorsally by the vertebral column and ventrally by the sternum.
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.