Learn About The Human Circulatory System

1One drop of blood contains a half a drop of plasma, 5 MILLION Red Blood Cells, 10 Thousand White Blood Cells and 250 Thousand Platelets.

2You have thousands of miles of blood vessels in your body. "Bill Nye the Science Guy" claims that you could wrap your blood vessels around the equator TWICE!

3Keep your heart healthy...it's going to have to beat about 3 BILLION times during your lifetime!

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It takes less than 90 seconds on average
for the blood to circulate through all of the body's 100,000 km of blood
vessels!

Each of the body's 600 billion cells gets fresh blood once every few minutes or less.

On the way out from the heart, blood is pumped through vessels called arteries and arterioles.

Pulmonary circulation is the portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart. The term is contrasted with systemic circulation. A separate system known as the bronchial circulation supplies blood to the tissue of the larger airways of the lung.

The Circulatory System via kwout

The blood circulation has two parts - the pulmonary and the systemic. The pulmonary circulation is the short section that carries blood which is low in oxygen from the right side of the heart to the lungs for 'refuelling'. It then || returns oxygen-rich blood to the left side of the heart. The systemic circulation carries oxygen-rich blood from the left side of the heart all around the body, and returns blood which is low in oxygen to the rightside of the heart

The circulatory system is an organ system that passes nutrients (such as amino acids, electrolytes and lymph), gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases and help stabilize body temperature and pH to maintain homeostasis.

This system may be seen strictly as a blood distribution network, but some consider the circulatory system as composed of the cardiovascular system, which distributes blood, and the lymphatic system, which distributes lymph. While humans, as well as other vertebrates, have a closed cardiovascular system (meaning that the blood never leaves the network of arteries, veins and capillaries), some invertebrate groups have an open cardiovascular system. The most primitive animal phyla lack circulatory systems. The lymphatic system, on the other hand, is an open system.

Two types of fluids move through the circulatory system: blood and lymph. The blood, heart, and blood vessels form the cardiovascular system. The lymph, lymph nodes, and lymph vessels form the lymphatic system. The cardiovascular system and the lymphatic system collectively make up the circulatory system.

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A labelled diagram of the human heart

The human heart is a muscular organ that provides a continuous blood circulation through the cardiac cycle and is one of the most vital organs in the human body. The heart is divided into four main chambers: the two upper chambers are called the left and right atria and two lower chambers are called the right and left ventricles.There is a thick wall of muscle separating the right side and the left side of the heart called the septum. Normally with each beat the right ventricle pumps the same amount of blood into the lungs that the left ventricle pumps out into the body. Physicians commonly refer to the right atrium and right ventricle together as the right heart and to the left atrium and ventricle as the left heart.Brendan Phibbs. The human heart: a basic guide to heart disease, Lippincott Williams & Wilkins, 2007, p. 1

The electric energy that stimulates the heart occurs in the sinoatrial node, which produces a definite potential and then discharges, sending an impulse across the atria. In the atria the electrical signal move from cell to cell http://www.medterms.com/script/main/art.asp?articlekey=5402 while in the ventricles the signal is carried by specialized tissue called the Purkinje fibers http://biology.about.com/library/organs/heart/blpurkinje.htmwhich then transmit the electric charge to the myocardium

The human heart and its disorders (cardiopathies) are studied primarily by cardiology.

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