The blood leaving the lungs has all its haemoglobin...

The blood leaving the lungs has all its haemoglobin oxygenated and gives up oxygen to the tissues because (a) The tissue can absorb $\mathrm{O}_{2}$ from oxyhaemoglobin. (b) $\mathrm{O}_{2}$ concentration in tissues is lower and $\mathrm{CO}_{2}$ concentration is higher as compared to lungs. (c) $\mathrm{O}_{2}$ concentration in tissues is higher and $\mathrm{CO}_{2}$ concentration is lower as compared to lungs. (d) Oxyhaemoglobin undergoes reduction.

The blood leaving the lungs has all its haemoglobin oxygenated and gives up oxygen to the tissues because
(a) The tissue can absorb $\mathrm{O}_{2}$ from oxyhaemoglobin.
(b) $\mathrm{O}_{2}$ concentration in tissues is lower and $\mathrm{CO}_{2}$ concentration is higher as compared to lungs.
(c) $\mathrm{O}_{2}$ concentration in tissues is higher and $\mathrm{CO}_{2}$ concentration is lower as compared to lungs.
(d) Oxyhaemoglobin undergoes reduction.

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Key Concepts

Concentration Gradient

The movement of gases like oxygen and carbon dioxide between the blood and tissues is driven by differences in their concentrations, or partial pressures. Oxygen diffuses out of the blood where its concentration is higher and into tissues where it is lower, which is a fundamental principle of gas exchange in the body.

Bohr Effect

The Bohr effect is a phenomenon where an increase in carbon dioxide levels or a decrease in pH reduces the affinity of hemoglobin for oxygen. This allows hemoglobin to release oxygen more easily in tissues where metabolic activity produces more carbon dioxide and results in a lower pH.

Oxyhemoglobin Dissociation Curve

The oxyhemoglobin dissociation curve illustrates the relationship between the partial pressure of oxygen and the percentage of hemoglobin saturation. Shifts in the curve, such as a rightward shift due to the Bohr effect, indicate conditions under which hemoglobin releases oxygen more readily to meet the metabolic demands of tissues.

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