Question

1. how is oxygen carried from the lungs to the tissues? it leaves the alveoli and enters mucus. it leaves the bronchi and enters capillaries. it binds to a protein called hemoglobin in red blood cells.

Explanation:

Oxygen diffuses from alveoli into capillaries. In capillaries, it binds to hemoglobin (a protein in red blood cells). Red blood cells then transport oxygen - rich blood to tissues. Mucus is not involved in oxygen transport. Oxygen does not leave bronchi to enter capillaries (it leaves alveoli). So the correct way oxygen is carried from lungs to tissues is by binding to hemoglobin in red blood cells.

Answer:

It binds to a protein called hemoglobin in red blood cells.