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
In a shark's circulatory system, the heart pumps blood first to the gills where it is oxygenated, then to the organs and muscles, and finally back to the heart. To remain oxygenated, the blood must flow continually, and this is accomplished through the opening and closing of a shark's mouth as well as the muscle movements of its body.Full Answer >
The aortic arches serve as a heart in an earthworm's circulatory system. There are five pairs of aortic arches, located near the head of the earthworm, that function much like a human heart.Full Answer >
The heart and the lungs are the primary organs of the circulatory system. The lungs are responsible for adding oxygen to blood. This oxygen-rich blood is then pumped to the heart, which then circulates it through the arteries to all the tissues throughout the body. Veins then return the blood for the addition of new oxygen and recirculation.Full Answer >
The basic circulatory system of vertebrate animals, which are those with a backbone, consists of a heart, the blood and the arteries and system of blood vessels. The heart pumps the blood first to the arteries and then throughout the body via the system of blood vessels.Full Answer >