Solution:

Transportation  of Oxygen.

1. Oxygen which we inhaled reaches the alveoli.

2.  The partial pressure of oxygen is greater in alveoli that causes diffusion of oxygen to capillaries and combines with haemoglobin to form oxyhaemoglobin.

3. The oxygenated blood reaches the organ which has a lower partial pressure than alveoli.

4. The bond between oxygen and hemoglobin will be inconstant in these organs and breaks releasing oxygen into the organs.

Transportation of Carbon Dioxide:

1. The carbon dioxide which is released is carried out by various organs to the alveoli through capillaries which have lower intra pulmonary pressure than the organs.

2. Intra pulmonary pressure is much lower in the alveoli as compared to the capillaries. Therefore the carbon dioxide will diffuse into alveoli from the capillaries.

3. In Red blood cells carbon dioxide merges with water and forms carbonic acid. It is a very weak form and gets disassociated into hydrogen and bicarbonate ion.

4. Carbon dioxide is also transferred through plasma in the form of bicarbonate ions.