Basic structure of heart, Biology

Basic Structure of Heart

The heart is small organ about the size of one's fist, located in the middle and slightly to the left of the mediastinum in the chest. The wider top part is the base and the blunt tip projecting forward and to the left if the apex. The heart is enclosed by the pericardium which is thick, fibrous and non-elastic. It consists of two layers: the inner layer-visceral layer and the outer parietal layer. The two pericardial surfaces are separated by a pericardial space that contains approximately 10-20 ml of thin, clear pericardial fluid which acts as a lubricant and reduces friction produced by the pumping action of the heart.

Epicardium-an epithelial single-celled layer surrounding the heart, the innermost layer of the pericardium. Myocardium is the actual heart muscle layer composed of striated muscle fibers. The myocardium is responsible for the energy created to eject a volume of blood. Therefore, it is thicker in the ventricles than in the atria. Endocardium is the inner layer and consists of endothelial tissue lining the entire interior of cardiac chambers and covers the heart valves.

Posted Date: 10/30/2012 5:40:39 AM | Location : United States







Related Discussions:- Basic structure of heart, Assignment Help, Ask Question on Basic structure of heart, Get Answer, Expert's Help, Basic structure of heart Discussions

Write discussion on Basic structure of heart
Your posts are moderated
Related Questions
Interactions between minerals Copper deficiency has been identified as a serious problem for grazing ruminants. A deficiency may be due to low concentrations of Cu in forage a

INTRODUCTIO N - Endocrinolog y - Study of endocrine glands, hormones and their effects. Thomas Addison - Father of endocrinology. Described hormonal disease in 1855 kn

What is the type of reproduction that occurs in roundworms? What typical element do nematode sperm cells have? Nematodes reproduce sexually. The nematode sperm cell does not h

Illustrate the techniques of neurology A long-standing technique in neurology has been observed the effects on behaviour of lesions (cutting) or ablation (removal) of nerve tis

Syngamy - Protozoan The two gametes may be morphologically similar (isogametes) or dissimilar (anisogametes). The gametes also vary in form, they may be flagellated or amoeboi

Q. Can you define Regulation of Coronary Blood flow? During diastole when the aortic valve (AV) is closed, aortic diastolic pressure is transmitted through the dilated sinuses


Q. Consequences on the bony structures? Basal bone forms the dental skeletal structure. Wolff's law states that the bone remodels in relationship to the forces applied. With a

Intracellular Digestion We all know that unicellular organisms do not have a separate alimentary canal system. All the functions of life are carried out inside a single cell.

What is the cell division process directly related to the embryonic growth? The embryonic growth depends directly on mitosis. By this type of cell division the zygote separates