LO3: Describe the systemic, pulmonary and coronary circulations, including blood flow through the heart

What is the function of pulmonary circulation?

To carry deoxygenated blood from the right side of the heart to the lungs for gas exchange, then return oxygenated blood to the left side of the heart.

Trace the blood flow through pulmonary circulation (structures involved).

Right ventricle → pulmonary trunk → pulmonary arteries → lungs → pulmonary veins → left atrium.

What is the function of systemic circulation?

To deliver oxygenated blood from the left side of the heart to the body and return deoxygenated blood to the right side of the heart.

Trace the blood flow through systemic circulation (structures involved).

Left ventricle → aorta → body tissues → veins → superior and inferior vena cava → right atrium.

What is the function of coronary circulation?

To supply the heart muscle (myocardium) with oxygen and nutrients.

Where does coronary circulation originate and return?

Originates from the aorta via the coronary arteries and returns via the coronary veins into the coronary sinus, which empties into the right atrium.

How does blood enter and exit the heart in pulmonary circulation?

Enters via the right atrium and right ventricle; exits to the lungs via the pulmonary trunk and arteries, then re-enters the heart via pulmonary veins into the left atrium.

How does blood enter and exit the heart in systemic circulation?

Enters the left atrium, flows into the left ventricle, exits through the aorta to the body, and returns to the right atrium via the vena cavae.

How does coronary circulation connect to the aorta?

Coronary arteries branch directly from the ascending aorta just after it leaves the left ventricle.