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A hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there may be up to four chambers (as in humans), with two atria and two ventricles.
The heart
They carry blood from the right side of the heart to the lungs.
The pulmonary arteries
The main artery of the body, supplying oxygenated blood to the circulatory system. In humans it passes over the heart from the left ventricle and runs down in front of the backbone.
The aorta
The blood vessels that deliver oxygen-rich blood from the heart to the tissues of the body.
Arteries
Any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood towards the heart.
The veins
Small blood vessels.
Capillaries
Heart chamber that receives blood into the heart and drives it into a ventricle, or chamber, for pumping blood away from the heart.
Atrium
The system that circulates blood and lymph through the body, consisting of the heart, blood vessels, blood, lymph, and the lymphatic vessels and glands.
The circulatory system
It is a measure of the force that your heart uses to pump blood around your body
Blood pressure
Molecules that are long chains of lipid-carboxylic acid found in fats and oils and in cell membranes as a component of phospholipids and glycolipids.
Fatty acids
A serious medical emergency in which the supply of blood to the heart is suddenly blocked, usually by a blood clot.
Heart attack
A tube through which the blood circulates in the body. They are a network of arteries, arterioles, capillaries, venules, and veins.
Blood vessel
The red liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body.
Blood
Having to do with the lungs.
Pulmonary
a colourless, odourless reactive gas,The chemical element of atomic number 8 and the life-supporting component of the air.
Oxygen
A colourless, odourless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 per cent) and is absorbed by plants in photosynthesis.
Carbon dioxide
