circulatory system

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Information about the circulatory system;

Parts of the circulatory system consist of blood, blood vessels and the heart. Another name for the circulatory system is the cardiovascular system. The circulatory system is centered on the heart. The circulatory system transports materials throughout the entire body and it transports nutrients, water, and oxygen to the bodies cells. It also carries away waste such as carbon dioxide that body cells produce.

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Circulatory System: Facts, Function & Diseases

Circulatory System



All the output of blood from the left side of the heart goes into the aorta, the body’s largest artery. Other arteries branch from the aorta to supply blood to the head, limbs, and internal organs. The blood is drained from all these parts by veins into two large vessels, the inferior and superior venae cava, which deliver the blood back to the right side of the heart.


The heart contracts tirelessly – more than 2.5 billion times over an average lifetime – to pump blood around the body. These contractions are triggered by electrical impulses that originate in a specialized area of heart tissue. The signals spread through the muscle in the wall of the heart via a network of conducting fibres.


If an adult’s blood vessels were laid end to end, they would stretch out over 100,000 km (62,500 miles). There are three main types of vessel. Arteries carry blood from the heart to the body’s tissues, while veins carry blood back from the tissues to the heart. Small arteries are called arterioles and small veins are referred to as venules. The third and smallest type of vessel, capillaries, form a network connecting the smallest arterioles with the smallest venules.


Arteries have relatively thick elastic walls that enable them to withstand the high pressure of blood pumped from the heart. By the time the blood has been forced through capillaries and arrived in veins, its pressure has dropped, so veins have thinner walls.


-the heart beats about 3 billion times during an average life time.

-if you were to lay out all of the arteries, capillaries, and veins in one adult end to end they would measure about 60,000 miles long

-the average adult human has a resting heart rate of 75 beats per minute, the same average resting heart rate for a sheep.

-the heart can still beat even after being removed from the body


Blood is composed of a straw-coloured fluid, plasma, and huge numbers of blood cells that float in the plasma. Of the two main types of blood cell, red blood cells carry oxygen to the body’s tissues, and white blood cells help defend the body against infection. Blood also transports nutrients, proteins needed for blood clotting, and waste products.

Body system functions:

Heart pumps blood through your body. Blood acts as the body's transport system and protects it from infection. There are three different types of blood vessels , arteries have relatively thick elastic walls that enable them to withstand the high pressure of blood pumped from the heart. Veins  blood tissue to the heart. Capillaries form a net working system to connect the arteries to the veins.

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