TOPIC 1.CLASSIICATION KINGDOM FUNGI
The wall of the heart is made up of
the cardiac muscles. Cardiac muscle is never fatigued (tired). It works
continuously as long as a person is alive. This type of muscle is found only in
the heart.
The wall of the heart has three
layers:
The epicardium is
the outer protective layer.
The myocardium is
the middle layer.
The endocardiumis
the inner most layer. This layer is continuous with the lining of the blood
vessels attached to the heart.
The coronary artery supplies the
heart with oxygenated blood. The coronary vein carries blood containing waste
materials away from the heart.
The vena cava and pulmonary vein
bring blood from the rest of the body to the heart. The aorta and pulmonary
artery transport blood from the heart to the rest of the body.
The internal structure of the
mammalianheart
Figure shows a longitudinal section
of the mammalian heart
