NEET BIOLOGY

Detailed explanation-1: -Assertion :The role of oxygen in the regulation of respiratory rhythm is quite insignificant. Reason: Increased PCO2 and H+ concentration inputs from chemoreceptors can activate respiratory rhythm centre to make necessary adjustments.

Detailed explanation-2: -CO2 is a gas that is involved in the regulation of respiratory rhythm. It helps to maintain a normal pH level in the respiratory system and helps to stimulate the release of oxyhemoglobin from the cells. 2. H+ is a gas that is involved in the regulation of respiratory rhythm.

Detailed explanation-3: -There are receptors for carbon dioxide and hydrogen ion in the carotid artery and aortic arch. As soon as they bind signals are being sent to respiratory rhythm centre to control the respiratory process. Therefore the role of oxygen in controlling respiratory rhythm process in insignificant.

Detailed explanation-4: -A special centre in the medulla region of the brain is primarily responsible for regulating respiratory rhythms. This is the ‘Respiratory Rhythm Center’. This centre produces rhythmic nerve impulses that contract the muscles responsible for inspiration (diaphragm and external intercostal muscles).