Question

question 13
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which of the following systems controls the level of carbonic acid in the blood?
cardiovascular system
respiratory system
renal system
digestive system

Explanation:

The respiratory system plays a crucial role in gas exchange. When we breathe, we inhale oxygen and exhale carbon dioxide. Carbon dioxide (\(CO_2\)) combines with water (\(H_2O\)) in the blood to form carbonic acid (\(H_2CO_3\)). By regulating the rate of breathing (i.e., how much \(CO_2\) is exhaled), the respiratory system controls the amount of \(CO_2\) available to form carbonic acid, thus controlling the level of carbonic acid in the blood.

• The cardiovascular system is mainly responsible for transporting blood, nutrients, and gases (but not directly controlling carbonic acid levels by gas - exchange regulation).
• The renal system is involved in filtering blood, regulating electrolyte balance, and acid - base balance (but in a different way than the respiratory system for carbonic acid. It mainly deals with bicarbonate and other non - volatile acids).
• The digestive system is for breaking down food, absorbing nutrients, and eliminating waste, and has no direct role in carbonic acid level regulation in the blood.

Answer:

Respiratory system