Diffusion pressure alone becomes insufficient for oxygen delivery to all body parts in large animals.
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Large animals rely on respiratory pigments for efficient oxygen transport because diffusion alone is insufficient to supply oxygen to all body parts. Respiratory pigments, like hemoglobin in humans, bind with oxygen in the lungs and carry it to tissues with oxygen deficiency. This enhances the oxygen-carrying capacity, ensuring effective delivery to distant body regions. The pigments can release oxygen where it is needed and pick up more in oxygen-rich areas. This mechanism is essential for meeting the oxygen demands of large, complex organisms, providing a more sophisticated and adaptable method of oxygen transport compared to simple diffusion.