Which of the following is a characteristic sign of respiratory alkalosis?

Hypocapnia is indeed a characteristic sign of respiratory alkalosis. This condition occurs when there is a significant decrease in carbon dioxide (CO2) levels in the blood, usually due to hyperventilation, where an individual breathes excessively. When carbon dioxide levels drop, the blood pH rises, leading to alkalosis. This is because CO2 is in equilibrium with carbonic acid in the blood, and when CO2 decreases, the acidity of the blood decreases, making it more alkaline.

In the context of respiratory alkalosis, the lungs are actively expelling more CO2 than the body is producing, resulting in hypocapnia. Patients may experience symptoms such as lightheadedness, tingling, and palpitations as a result of this condition.

The other options presented do not accurately describe characteristics of respiratory alkalosis. Bradycardia usually relates to other conditions, such as increased vagal tone or certain heart conditions, and is not associated with higher respiratory rates. A decreased respiratory rate does not align with respiratory alkalosis, as that typically reflects a compensated condition, not a hyperventilation scenario. Increased aluminum levels are unrelated to the respiratory mechanics or pH balance in the context of respiratory alkalosis. Thus, hypocapnia correctly