explain transport of oxygen in cardiorespiratory system.
Answers
Answer:
Oxygen enters the body through the respiratory system, coming from the outside environment and into the lungs. It then crosses the alveolar membrane and capillary endothelium to get into the bloodstream. Once in the blood, oxygen needs to be transported to the various tissues of the body.
★ TRANSPORT OF OXYGEN:-
It is the transport of O2 from lungs to various tissues.
It occurs in 2 ways:-
→ In physical solution (blood plasma): About 3% of O2 is carried in a dissolved state through plasma.
→ As oxyhaemoglobin: About 97% of O2 is transported by RBC. O, binds with haemoglobin to form oxyhaemoglobin. This is called oxygenation. Hb has 4 haem units. So each Hb molecule can carry 4 oxygen molecules. Binding of Oz depends upon pO2, pCO2, H+ ion concentration (pH) and temperature.
→ In the alveoli, high pO2, low pCO2, lesser H ion
concentration and lower temperature exist. These factors are favourable for the formation of oxyhaemoglobin.
→ In tissues, low pO2, high pCO2, high H* ions and high temperature exist. So Hb_Og dissociates to release O2.
→ Every 100 ml of oxygenated blood can deliver around 5 ml of Oz to the tissues under normal physiological conditions.