In 100 ml deoxygenated blood, blood carries _______ ml CO₂ to alveoli.

The correct answer is 4 ml

Explanation:

• The transport of carbon dioxide (CO₂) in the blood is a critical process for maintaining the body’s acid-base balance and for the removal of metabolic waste.
• CO₂ is carried in the blood from the tissues to the lungs, where it is exhaled.
• In deoxygenated blood, CO₂ is transported in three main forms: dissolved in plasma, as bicarbonate ions (HCO₃-), and bound to hemoglobin as carbaminohemoglobin.
• The majority of CO₂ is carried in the form of bicarbonate ions, but a significant portion is also carried dissolved in plasma and attached to hemoglobin.
• The correct amount of CO₂ carried by 100 ml of deoxygenated blood to the alveoli is 4 ml.  The CO₂ is transported from the tissues to the lungs where it is expelled during exhalation.