Share I love my heart II
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What is the main function of the heart?
The heart pumps blood throughout the body, delivering oxygen and nutrients while removing waste.
Name the four chambers of the heart.
Right atrium, right ventricle, left atrium, left ventricle.
Which valve prevents blood from flowing back into the left ventricle?
The aortic valve.
What is the thickest chamber of the heart?
The left ventricle
What is the term for the relaxation phase of the heartbeat?
Diastole
Which two circuits make up the circulatory system?
The pulmonary circuit (lungs) and the systemic circuit (rest of the body).
Which blood vessels carry deoxygenated blood back to the heart?
Veins, specifically the superior and inferior vena cava.
What is the normal resting heart rate for an adult?
Typically between 60–100 beats per minute.
What is preload?
Preload refers to the volume of blood in the ventricles before contraction.
What is afterload?
Afterload is the resistance the heart must overcome to pump blood.
What is the significance of the refractory period in cardiac muscle cells?
It prevents the heart from undergoing sustained contractions (tetany) and ensures rhythmic beating.
What is the role of the Purkinje fibers in cardiac conduction?
They distribute the electrical impulse throughout the ventricles, ensuring coordinated contraction.
What is the physiological function of the pericardium?
It protects and lubricates the heart, preventing friction during contraction.
What is the function of the endothelium in blood vessels?
It regulates blood flow, prevents clotting, and controls vessel dilation.
What is the difference between systolic and diastolic blood pressure?
Systolic pressure is the force when the heart contracts, while diastolic pressure is the force when the heart relaxes.
