What chamber of the heart receives oxygenated blood from the lungs?
The left atrium receives oxygen-rich blood from the lungs via the pulmonary veins.
What structure separates the left and right sides of the heart?
The septum is the muscular wall that divides the left and right sides of the heart.
Which valve prevents backflow of blood into the left atrium?
The mitral valve prevents blood from flowing back into the left atrium from the left ventricle.
What is the function of the right ventricle?
The right ventricle pumps deoxygenated blood to the lungs through the pulmonary artery.
Where does the heart's electrical impulse originate?
The sinoatrial (SA) node, located in the right atrium, initiates the heart's electrical activity.
Which part of the heart has the thickest wall?
The left ventricle has the thickest wall because it must pump blood to the entire body.
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What vessels supply blood to the heart muscle?
The coronary arteries supply oxygenated blood to the myocardium (heart muscle).
What phase of the cardiac cycle involves ventricular contraction?
Systole is the phase when the ventricles contract and pump blood out of the heart.
What is the function of the pericardium?
The pericardium is a double-walled sac that surrounds the heart and reduces friction during heartbeats.