What characteristic of cardiac muscle causes contraction of the heart as a unit?

The cardiac muscle has intercalated disk that allows rapid transmission of the impulse. This will allow the cardiac muscle to have a coordinated way. The heart muscle has pacemaker that will spread the signal in regular time. The transmission of impulse is also controlled by a few checkpoint like the bundle of his to make the signal to the Purkinje fiber of left and right ventricle at the same time.

The general characteristics of blood are red iron and heat the three types of formed element cells are blood cells, white blood cells and , iron cells