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specialised heart muscle tissue between the right atrium and right ventricle which conducts the normal electrical impulse from the atria to the ventricles.
a measure showing the number of dependents (aged 0-14 and over the age of 65) to the total...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
the condition in which a persons' normal capacity to think or act is affected due to the...
unicellular organisms that do not have a proper nucleus or membrane bound organelles.
muscle found only in the heart and forming the muscle wall (myocardium) of the heart.