Which respiratory pigment gives muscle tissue its red or dark color and serves as an oxygen-storage reserve in skeletal muscles?

💡 Solution & Explanation

Myoglobin is a cytoplasmic protein consisting of a single polypeptide chain with an iron-containing heme group that stores and diffuses oxygen within striated muscle tissues. Alternative compounds like hemoglobin transport oxygen through the bloodstream, while hemocyanin uses copper instead of iron to transport oxygen in mollusks and arthropods. Understanding this distinction is crucial because myoglobin concentration is exceptionally high in diving mammals like whales, enabling them to remain underwater for prolonged periods.