The globins are a superfamily of heme-containing globular proteins, involved in binding and/or transporting oxygen. ... Both of these proteins reversibly bind oxygen via a heme prosthetic group. They are widely distributed in many organisms.

How does hemoglobin work in the body?

Hemoglobin in blood carries oxygen from the lungs or gills to the rest of the body (i.e. the tissues). There it releases the oxygen to permit aerobic respiration to provide energy to power the functions of the organism in the process called metabolism.

What is the main function of myoglobin?

myoglobin, a protein found in the muscle cells of animals. It functions as an oxygen-storage unit, providing oxygen to the working muscles. Diving mammals such as seals and whales are able to remain submerged for long periods because they have greater amounts of myoglobin in their muscles than other animals do.