Systole

Diastole

Diastole

Atrial Systole

Ventricular Systole

What happens when the compartment has been emptied of blood?

Which ventricle has a thicker muscular wall ? Why?

Atrio- Ventricular Valves (2)

Why are there valves in veins ?

The heartbeat is initiated in an area of the right atrium called the ___

The wave of excitation passes across both atria until it reaches an area of tissue in the septum called the ____

This in turn passes the wave to a group of fibers called the _____which transfers the wave to the apex of the ventricles.

This causes the ventricles to ____ from the base upwards and forces blood to flow out of the heart through the aorta and ___

Name two specialized structural features of Red blood cells,

Blood is made up of .....