Every 100 mL of deoxygenated blood delivers __A__ mL of CO₂ to the ___B___. Mark the correct set of A and B.

	A	B
1.	5 mL	alveoli
2.	5 mL	tissues
3.	4 mL	alveoli
4.	4 mL	tissues

Every 100 mL of deoxygenated blood delivers approximately 4 mL of CO₂ to the alveoli.

Every 100 mL of oxygenated blood can deliver around 5 mL of O₂ to the tissues under normal physiological conditions.