Oxygen enters the capillaries and what from the capillaries passes into the lungs?

The primary function of the respiratory system is to exchange oxygen and carbon dioxide Inhaled oxygen enters the lungs and reaches the alveoli Oxygen passes quickly through this air blood barrier into the blood in the capillaries Similarly carbon dioxide passes from the blood into the alveoli and is then exhaled

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.