Question

Oxygen and carbon dioxide pass back and forth between the alveoli and the blood through _____.

veins
arteries
capillaries
bronchioles

Answer 1

Option. Capillaries.

Step-by-step explanation:

The capillaries can be defined as the types of blood vessels, having only one cell thick endothelial wall and are considered as the smallest vessels.

The main function of blood capillaries is to transport nutrients, oxygen, and waste products, such as carbon dioxide back and forth between the blood and alveoli.

Thus, the correct answer is option). capillaries.

Answer 2

Oxygen and carbon dioxide easily pass back and forth between the alveoli and the blood through the capillaries