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The muscular walls of the heart consist of three major "layers." The bulk of the walls is made up of a layer of cardiac muscle and is called the myocardium. The muscle is enclosed on the outside by the epicardium and on the inside by the endocardium.
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library.thinkquest.org/C003758/Structure/walls.htm
library.thinkquest.org/C003758/Structure/walls.htm
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The fibrous layer - composed of tough, white fibrous tissue covering the heart and anchoring it to the diaphragm, sternum and large blood vessels. ... Visceral pericardium - this layer is also called the epicardium. It is well integrated with the muscular wall of the heart. It is often infiltrated with fat.
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faculty.ucc.edu/biology-potter/heart.htm
faculty.ucc.edu/biology-potter/heart.htm
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The entire structure is enclosed a tough fibrous sac, the pericardium, containing a small amount of lubricating fluid which eliminates friction. The pericardium also holds the heart in position during postural changes and limits the dilation. The thick muscular wall of the heart called the myocardium, is responsible for...
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www.ultraent.com/html/aboutglands/200303.html
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When the heart stops beating, we die unless a special device circulates and oxygenates our blood. The heart is a large, hollow, muscular organ divided into two pumps that lie side by side. Veins transport blood from throughout the body to the right-sided pump.
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www.toxassociates.com/heart.htm
www.toxassociates.com/heart.htm
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Learn the parts of the heart and how it functions. ... Pump it Up The heart is a muscular pump with four chambers. The two upper ones are called atria and the two thicker, lower ones are called ventricles. The left atrium and ventricle are separated from the right atrium and ventricle by a muscular wall known as the septum.
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health.discovery.com/centers/heart/toughmuscle.html
health.discovery.com/centers/heart/toughmuscle.html
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Arteries are tough on the outside and smooth on the inside. An artery actually has three layers: an outer layer of tissue, a muscular middle, ... The muscular wall of the artery helps the heart pump the blood. When the heart beats, the artery expands as it fills with blood. When the heart relaxes, the artery contracts,
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www.becomehealthynow.com/article/bodycardiobloodvessels...
www.becomehealthynow.com/article/bodycardiobloodvessels/696
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Your heart weighs well under a pound and is only a little larger than your fist, but it is a powerful, long-working, hard-working organ that is a ... The heart is a hollow organ. Its tough, muscular wall (myocardium) is lined by a thin, strong membrane (endocardium) and is surrounded by a fibrous bag (pericardium).
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www.childrensmemorial.org/depts/siragusa/heart/transpla...
www.childrensmemorial.org/depts/siragusa/heart/transplant/more_heart.asp
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Your heart is a hard-working muscle. Find out more in this article for kids. ... The heart has a left ventricle and a right ventricle. Their job is to squirt out the blood to the body and lungs. Running down the middle of the heart is a thick wall of muscle called the septum (say: sep-tum).
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kidshealth.org/kid/htbw/heart.html
kidshealth.org/kid/htbw/heart.html
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The upper part of the heart is made up of the other two chambers of the heart, the right and left atria. The right and left atria receive the blood entering the heart. A wall called the interatrial septum divides the right and left atria, ... Veins carry blood back to the heart. They're not as muscular as arteries,
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kidshealth.org/parent/general/body_basics/heart.html
kidshealth.org/parent/general/body_basics/heart.html
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