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Botany

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18 Jan 2009 19:43:30 IST

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explain the structure of human heart?

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explain the structure of human heart?

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N.P. Singh

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Joined: 17 Dec 2008

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22 Jan 2009 14:20:07 IST

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Structure of the Heart

The human heart is a hollow, upside-down, pear-shaped shell. The inside of the heart is divided into four chambers, the left and right atria and the left and right ventricles, which periodically fill with blood and empty. The two atria form the curved top of the heart. The ventricles meet at the bottom of the heart to form a pointed base which points toward the left side of the chest. The left ventricle contracts most forcefully, so the heart beat is felt most strongly on the left side of the chest. A wall, called the septum, separates the right and left sides of the heart. A valve connects each atrium to the ventricle below it. The mitral or bicuspid valve connects the left atrium with the left ventricle. The tricuspid valve connects the right atrium with the right ventricle.

Diagram of the heartThe Heart Wall

The heart wall consists of three layers: epicardium, myocardium, and endocardium. The epicardium is a thin outer layer which gives the surface of the heart a smooth, slippery texture. The endocardium is the smooth inner lining of the heart and is continuous with the large blood vessels to which the heart connects. The myocardium makes up the bulk of the heart and is responsible for its pumping action. cells) which are connected by electrical synapses (gap junctions) which allow muscle action potentials to spread from fibre to fibre. in the right atriumfrom the body (via superior and inferior vena cavae) and pump it, via the right ventricle, into the lungs (pulmonary circulation) so that carbon dioxide can be dropped off and oxygen picked up (gas exchange). This happens through the passive process of diffusion. The left side (see left heart) collects oxygenated blood from the lungs into the left atrium. From the left atrium the blood moves to the left ventricle which pumps it out to the body (via the aorta). On both sides, the lower ventricles are thicker and stronger than the upper atria. The muscle wall surrounding the left ventricle is thicker than the wall surrounding the right ventricle due to the higher force needed to pump the blood through the systemic circulation

All the things regarding heart in this small explaination so plz i think this will assist u

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