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 >
Involuntary muscles are found in the circulatory system, digestive system and urinary system. Humans do not exert any control over these muscles, which is why they are called involuntary.Full Answer >
The human heart is a pump made of muscle that pushes blood through the human body. The heart contains the aorta, anterior vena cava, semilunar valve, right atrium, right ventride, posterior vena cava, pulmonary artery, pulmonary vein, septum and left ventricle.Full Answer >
The average weight of a man’s heart is 10 ounces, and the average weight of a women’s heart is 8 ounces. The average heart rate for women is 78 beats per minute, and the average heart rate for men is 70 beats per minute.Full Answer >