give short note on myoglobin.
Myoglobin is an iron- and oxygen-binding protein found in the muscle tissue. It is related to pigment called hemoglobin, which is found in the red blood cells. Red muscle fibres have higher concentration of myoglobin than white muscle fibres. High concentrations of myoglobin in such muscle cells allow organisms to hold their breaths longer and these muscle cells are called aerobic muscles.