Question #5d2e4
1 Answer
Capillaries in the lungs are responsible for enabling oxygen and carbon dioxide transfer for efficient respiration.
Explanation:
Capillaries in the lungs surround the alveoli , which are tiny sacs at the end of the bronchioles.
These sacs are the last stage of the respiratory system; the trachea or windpipe divides into two bronchi, each bronchus entering one lung, the bronchi dividing and subdividing into bronchioles and ending in the alveoli.
The alveoli are surrounded by capillaries which are the end of the pulmonary arteries (coming from the heart) which divide and subdivide into arterioles ending in capillaries that later combine into venules and finally the pulmonary veins which return to the heart.
The capillaries surrounding the alveoli are only one cell thick, just like the alveoli, because of which oxygen in the inhaled air passes easily into the blood stream and carbon dioxide in the blood passes into the lungs for exhalation.
