Question

chemoreceptors
what is the role of chemoreceptors in homeostasis?
settling the circadian rhythm
monitoring levels of oxygen and carbon dioxide
maintaining balance and proprioception
detecting changes in body temperature

Explanation:

Chemoreceptors are sensory receptors that detect chemical changes. In the context of homeostasis, they are specifically involved in monitoring chemical substances in the body.

• Circadian rhythm (related to the body's internal clock) is mainly regulated by the suprachiasmatic nucleus in the hypothalamus, not chemoreceptors.
• Balance and proprioception (sense of body position) are functions of the vestibular system (in the inner ear) and proprioceptors in muscles, tendons, and joints, not chemoreceptors.
• Detecting changes in body temperature is the role of thermoreceptors, not chemoreceptors.
• Chemoreceptors, such as those in the carotid and aortic bodies, monitor levels of oxygen (\(O_2\)) and carbon dioxide (\(CO_2\)) in the blood. When \(O_2\) levels are low or \(CO_2\) levels are high (which can affect the pH of the blood), they send signals to the respiratory center in the brainstem. This leads to adjustments in breathing rate (e.g., increasing breathing rate to take in more \(O_2\) and expel more \(CO_2\)) to maintain the body's internal balance (homeostasis) in terms of gas exchange and blood pH.

Answer:

B. Monitoring levels of oxygen and carbon dioxide