This chamber of the heart has the thickest walls.

This is a bag that surrounds the heart, secreting fluid to lubricate the heart.

Flap-like valve that prevents flow of blood from the ventricle into the atrium.

Heart chamber that pushes oxygenated blood to body tissues.

Vessel that deliver blood to nourish the myocardium.

Considered the pacemaker of the heart because it automatically initiates the heart beat.

Monitors the blood and stimulates the SA node to fire more or less frequently.

Why do ventricle contractions start at the bottom of the chamber?

Which side of the heart is represented:

vena cava --> atrium --> AV valve --> ventricle --> pulmonary artery

Functions to separate the left side from the right side of the heart.

Why do the AV valves close?

Why do the semilunar valves open?

Which type of vessel has the lowest speed?

Why is it important for blood to travel in capillaries slowly & with low pressure.

What type of vessel is shown?