The cardiorespiratory system generally refers to the interaction of the heart, blood vessels, and lungs as they work to take in oxygen for cellular use and remove waste products from the body. Arteries carry fresh oxygen... More »

The heart draws oxygenated blood from the lungs and distributes it to the rest of the body using a system of arteries and veins. Small coronary arteries and the pulmonary veins provide oxygenated blood into the heart. Th... More »

The beginning of the blood's journey through the body happens when the heart relaxes between beats and the blood flows from the atria to the ventricles from where the blood is pushed into the large arteries and then on... More » Science Human Anatomy

The blood circulatory system transports nutrients and oxygen throughout the body. The system is comprised of the heart and blood vessels. More »

The heart is part of the cardiovascular system and works like a pump to move blood throughout the body. The cardiovascular system also consists of the veins, arteries and capillaries that route blood throughout the body,... More »

Blood enters the heart in the right atrium, passes into the right ventricle and is then pumped to the lungs; after leaving the lungs, the blood travels back into the left atrium, into the left ventricle and then flows in... More »

Urine is a liquid that removes waste products from the body after they are processed by the kidneys, according to WebMD. Urine is usually pale to deep yellow, and it gets its color from urochrome, a type of pigment. The ... More » Science Human Anatomy