Divided attention

Classified in Biology

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Heart:is a hollow,muscular organ,It consist of:
Endocardium:a layer of epithelial tissuethat lines 
the inside of the heart.It continue from the 
endothelium that lines the blood vessels.
Myocardium:middle layer is the thickest part of 
the heart.It is formed of cardiac muscle tissue.
themuscle fibres are long,striated and branched.
myocardial contractions are involuntary,fast and 
powerful.Pericardium:double membrane 
surrounding the heart.The space between the two
membranes is called the pericardial space.
Structure of heart:Chambers :heart is divided in 
four parts.Two uppers chambers(atria) and two 
lower(ventricles).Atria:thin walls blood flows 
from veins.Ventricles:thickest walls left ventricle 
thicker than right,blood leave heart and flow into 
arteries.The hear is separated by interventrcular
septum.Valves:atria and ventricles connected by 
atrioventricular valves.Right(tricuspid valve)
Left(mitral valve).Semilunar valve preven the 
blood flowing backwards into ventricles.

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