Q4. Assertion: oxygen dissociates from oxyhaemoglobin in the tissues. Reason: the tissues have low pO, high pCO, high H concentration and higher temperature. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion (NCERT page 189).
Q5. What is the maximum number of O molecules one haemoglobin molecule can carry?
Four (NCERT page 189).
Q6. Where is carbonic anhydrase found, and in which directions does it speed the reaction?
In very high concentration in the RBCs and in minute quantities in the plasma; it speeds the reaction in both directions, forming HCO and H at the tissues and CO and HO at the alveoli (NCERT page 190).
Q7. How much O can every 100 mL of oxygenated blood deliver to the tissues?
Around 5 mL under normal physiological conditions (NCERT page 189).