The oxygen needed for respiration moves from the lungs and into capillaries by simple diffusion. Once in the capillaries, what molecule or other component of blood is responsible for transporting oxygen in the circulatory system?
A)There is no transport molecule; oxygen remains free in the blood.
B)white blood cells
C)hemoglobin
D)cadherins

Question

Quizplus · Accepted Answer

Hemoglobin is a protein in red blood cells that binds to oxygen and transports it throughout the circulatory system.

The Oxygen Needed for Respiration Moves from the Lungs and into Capillaries