Why does hemoglobin accept oxegen molecules in the lungs but give up oxegen molecules in tissue?
It has soemthing to do with circulatory system. Mammal’s circulatory system has a four chambered heart and two loops of blood flow. When the right ventricle pumps the oxygen poor blood into arteries, the arteries will lead this blood to the pulmonary capilary bed to get oxygen, since this blood are poor in oxygen means they have a very low concentration of oxygen, and respecticely very high concentration of CO2, thus concentration gradients are created in the pulmonary(lungs) capillaries, then the blood will pick up oxygen and get rid of CO2.Evetually, this oxygen rich blood will go back to the left atrium of your heart. Then the left ventricle will pump the oxygen rich blood into the ateries as well, but this time, it is a differnt loop which leads the blood to the systemic capillaries, in this loop, the blood will travel through the whole body, since the body is constant needing oxygen to cellular respiration, thus there is always a concentration gradient between the oxygen rich bloo
