What is the significance of the sigmoid shape of the oxygen-hemoglobin dissociation curve in relation to oxygen transport?

A It allows for a more efficient release of oxygen to tissues with high metabolic rates ✓
B It enables hemoglobin to bind oxygen more tightly, preventing its release to tissues
C It facilitates the transport of carbon dioxide from tissues to the lungs
D It has no significant impact on oxygen transport

Explanation

The sigmoid shape of the oxygen-hemoglobin dissociation curve allows for a more efficient release of oxygen to tissues with high metabolic rates, as it enables hemoglobin to release oxygen more readily when oxygen levels are low.

Mnemonic

Sigmoid = S-shape → facilitates oxygen release

Source

Guyton and Hall Textbook of Medical Physiology
Hematology Hematology: Hemoglobin and Oxygen Transport Hematology: Hemoglobin and Oxygen Transport Medium MEDICAL Confidence: high