NEET BIOLOGY

Detailed explanation-1: -Myoglobin Stores O2 in Oxidative Muscle and May Enhance Diffusion. Myoglobin is a low-molecular weight protein of 16, 000 Da that contains one heme and binds one molecule of O2 per molecule of protein.

Detailed explanation-2: -Due to the presence of heme moiety, myoglobin serves as a carrier and store for oxygen in muscle cells of the body. Myoglobin has more affinity for oxygen as compared to hemoglobin. As a result, it can acquire oxygen from hemoglobin, hence transferring it from the blood to the muscle tissues.

Detailed explanation-3: -Bound Oxygen: Hemoglobin binds with four oxygen molecules and is responsible for carrying oxygen throughout the body. Myoglobin binds to a single oxygen molecule, stores oxygen in muscle tissues.

Detailed explanation-4: -Myoglobin facilitates oxygen diffusion. Myoglobin desaturates at the onset of muscle activity, which increases oxygen’s diffusion gradient from the capillaries to the cytoplasm. Myoglobin has also been shown to have enzymatic functions. It is necessary for the decomposition of bioactive nitric oxide to nitrate.