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 about Muscles
Most muscles are attached to bones by connecting tendons. Tendons are thick, tough cords of tissue that firmly attach to both the muscle and the bone, connecting the two. A few muscles attach directly to the bone without a connecting tendon.Full Answer >
Interesting facts about muscles include details about the number of muscles it takes to frown and walk, the strongest muscle in the body, the role of the muscles in shivering and the smallest and longest muscles in the body. As Ducksters points out, muscles work together without any conscious thought on a person's part.Full Answer >
Muscles rely on oxygen for energy, according to Men's Health. The energy oxygen provides is necessary for muscles to contract efficiently during work. With inefficient contracting, muscles are not as effective at performing physical work.Full Answer >
Women are incapable of developing their muscles, including the biceps, to the extent of most men due to their lack of testosterone. A woman's biceps, however, can still grow larger and stronger through exercises, such as the dumbbell curl and the chin-up that target this muscle and related muscles.Full Answer >