chambers of heart and blood pressure

heart chamber with the thickest wall

The fossa ovalis is visible in this chamber

These vessels return blood to the heart

The coronary sinus empties blood from cardiac circulation into this chamber

these vessels have thinner walls and transport oxygen poor blood

semilunar valves are forced open as pressure in the heart rises

The four pulmonary veins return oxygenated blood to this chamber

inferior discharging chambers on the left side of the heart

ventricular relaxation

Some of these larger vessels have valves to prevent backflow

Atrioventricular (AV) valve shut as pressure in the heart rises

pressure in the heart is low

nutrient and gas exchange occur in these vessels

Superior and inferior vena cava are classified as these types of vessels

blood pressure in these vessels is low or even negative

The vessels have a thicker walls and heavier tunica media

heart chamber that contain the sinoatrial node

venules drain these tiny beds of vessels

heart chamber that pumps blood to the pulmonary trunk

ventricular contraction

These vessels carry blood away from the heart

Roof of this chamber contains the bicuspid valve

Blood is ejected from the ventricles through pulmonary trunk and aorta

The aorta is classified as one of these vessels