The human heart is sometimes called a double pump because it drives blood along two separate pathways in the circulatory system. With each beat, the heart drives arterial blood through the body, and it draws venous blood back toward itself.Know More
The high-pressure loop of the system is arterial. Blood is pushed through this system when the left ventricle contracts to squeeze fresh, oxygenated blood through the aorta. From there, the blood flows throughout the body to deliver oxygen and essential nutrients to most of the body's cells. With the same ventricular contraction, the smaller right ventricle drives blood through the low-pressure system of deoxygenated blood. The left ventricle sends blood to the lungs to be enriched with oxygen prior to its return to the heart via the left atrium.
Venous blood from around the body flows into the right ventricle via the superior and inferior vena cavae. Between phases of ventricular contraction, valves inside the heart's two atria open to admit blood that's waiting to be sent through the body on the heart's next stroke. This dual system keeps exhausted blood from mingling with freshly oxygenated blood, ensuring that oxygen and nutrients are delivered and carbon dioxide and other cellular wastes are carried away with maximum efficiency.Learn more about Muscles
The skeletal muscles, the muscles that power voluntary movements of the body, aid the circulatory system as the primary method by which deoxygenated blood is pushed back to the heart through the veins. Veins have thin walls compared to arteries and are easily compressed as skeletal muscles contract, forcing blood along the vein. Backflow is prevented by the presence of valves within the veins, a feature arteries largely lack.Full Answer >
The heart is a single organ, but it functions as a double pump sending oxygen-depleted blood to the lungs to pick-up oxygen and unload carbon dioxide, while simultaneously sending oxygen-loaded blood coming from the lungs to cells throughout the body. The heart's right ventricle pumps blood to the lungs, while the left ventricle pumps the oxygenated blood to the body cells. The left ventricle is the stronger of the two and performs the more demanding part of the double-pump work.Full Answer >
An individual muscle fiber may also be called a myofiber or a muscle cell. Each muscle fiber is a single, narrow cell that spans the entire length of a muscle. There are three different kinds of myofibers found in the body: skeletal, cardiac and smooth.Full Answer >
According to About.com, the muscles located on the inner thigh by the pelvic area are called the adductor muscle group. This muscle group, which is also called the groin muscles, consists of six muscles in total.Full Answer >