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
The muscles that attach to the coracoid process are the pectoralis minor, the coracobrachialis and the biceps brachii. The coracoid process is part of the shoulder blade, or scapula. It gets its name from its resemblance to a crow's beak.Full Answer >
Four muscles are used to chew food. They are the masseter, temporalis, medial pterygoid and lateral pterygoid. These muscles are responsible for the chewing action, moving the mandibles from side to side, grinding teeth and even helping us speak. They are also referred to as "muscles of mastication."Full Answer >
During the reflex arc, sensory neurons carry signals from receptors to interneurons in the spinal cord, which send signals to activate muscles via motor neurons without first signalling the brain. This sequence provides much quicker responses to certain stimuli and is totally involuntary.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 >