As with all tissues dependent on a vascular supply, muscles depend on red blood cells to transport oxygen to them. Red blood cells, in turn, rely on an oxygen transport protein called hemoglobin to carry oxygen to all parts of the body.Know More
Hemoglobin is a tetramer, meaning a protein composed of four subunits. Hemoglobin also contains four cofactors called heme, a ring-shaped structure with an iron atom at its center. Iron binds oxygen reversibly, allowing hemoglobin to pick up oxygen in the lungs and drop it off in the tissues where it is needed.
Cardiac and skeletal muscles also contain a protein called myoglobin, which binds oxygen more tightly than hemoglobin. Myoglobin provides the heart and skeletal muscles with an oxygen reserve; this comes in handy during short bursts of physical activity.Learn More
According to Muscle Physiology from the University of California, San Diego, ATP supplies the energy needed by muscles to contract. Ironically, ATP is also needed for muscle relaxation. The chemical stimulates muscle relaxation by disconnecting myosin and actin.Full Answer >
The deltoid muscle, located on the outside of the shoulder, helps rotate the upper arm and extend the arm at the shoulder. The deltoid has three different sets of fibers that help perform specific tasks.Full Answer >
Muscle cells live for approximately 15 years. However, most of the tissues within the human body regenerate, and all the dead cells are replaced at some point during the lifespan of the body.Full Answer >
Enthesopathy of the hip is an arthritic disorder in the sockets of the hip bone that affects the tendons and ligaments that are attached there. This means that the connections are not working correctly or are damaged in some way, creating problems with the connecting tissues between the hips and other bones. This causes pain or difficulty while moving or walking.Full Answer >