Complete the following sentence by selecting the correct...

Complete the following sentence by selecting the correct option. Receptors associated with aortic arch and carotid artery can recognize changes in (i) and (ii) concentration and send necessary signals to _iii) for remedial actions. (i) (ii) (iii) (a) $\mathrm{O}_{2} \quad \mathrm{CO}_{2}$ pneumotaxic centre (b) $\mathrm{CO}_{2} \quad \mathrm{H}^{*}$ thythm centre 'c) $\mathrm{CO}_{2} \quad \mathrm{H}^{+}$apneustic centre d) $\mathrm{O}_{2} \quad \mathrm{H}^{+}$pneumotaxic centre

Complete the following sentence by selecting the correct option. Receptors associated with aortic arch and carotid artery can recognize changes in (i) and (ii) concentration and send necessary signals to _iii) for remedial actions.
(i)
(ii)
(iii)
(a) $\mathrm{O}_{2} \quad \mathrm{CO}_{2}$ pneumotaxic centre
(b) $\mathrm{CO}_{2} \quad \mathrm{H}^{*}$ thythm centre 'c) $\mathrm{CO}_{2} \quad \mathrm{H}^{+}$apneustic centre
d) $\mathrm{O}_{2} \quad \mathrm{H}^{+}$pneumotaxic centre

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Key Concepts

Peripheral Chemoreceptors

These are specialized receptors located in regions such as the carotid bodies and aortic arch that sense changes in the chemical composition of blood. They are particularly sensitive to the levels of oxygen and hydrogen ions (which reflect changes in pH), thereby playing a key role in triggering reflex adjustments in respiration.

Blood Gas Homeostasis

This concept refers to the maintenance of optimal levels of oxygen and carbon dioxide in the blood, which is critical for cellular metabolism and overall physiological stability. Adjustments in the respiratory rate in response to variations in O? and H? levels are central to this homeostatic regulation.

Respiratory Centers in the Brainstem

Located mainly in the medulla and pons, these centers, including structures like the pneumotaxic centre, process sensory input from chemoreceptors. They modulate respiratory drive by adjusting the rate and depth of breathing to meet the body's metabolic needs.

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