🔊 → Your aortic & pulmonic valves close after the lower chambers relax. This prevents blood from leaking back into the heart.
Blood flows through these chambers in a specific order. To keep the blood moving in the right direction, the heart uses four valves. These valves act like one-way doors; they open to let blood through and snap shut to prevent it from flowing backward. what makes the lub dub sound
Think of it like a household door. The act of you walking through the door is silent, but the sound of the door clicking shut is distinct. In the heart, the "click" is magnified by the force of blood pressure. 🔊 → Your aortic & pulmonic valves close
The first sound, the "lub," is known medically as (the first heart sound). This sound occurs at the beginning of the contraction of the ventricles (systole). To keep the blood moving in the right