works, what it does to prevent heart attacks and control high blood pressure???
i can try to help you out, i dont know how much help i will be though... your blood pressure is determined on the amount of blood pumped out of the heart every minute and how much pressure is put on the arteries(the vessels that bring blood to your body) when your heart contract. So when your blood pressure is high your heart has to work harder to push the blood into the arteries. Within your heart you have these receptors called Beta 1 receptors. When your body notices a change in your blood pressure it activates something called your sympathetic nervous system. Maybe you have heard it also called your "fight or flight" response (for an example when a fire alarm goes off you get the heart racing, increased awareness of your surrounds feeling.) When this system is activated in your body your heart rate goes up, your blood vessels in certain areas of the body get narrower, while the blood vessels to your heart and some muscles dilate, and you breath faster.
So what propanolol does is it helps lower your blood pressure by stopping this reaction from happening, (this is why it is called a beta blocker :) ) so by blocking this from activating it in turn decreases your heart rate which is a good thing b/c it is not pumping effectively when it is going to fast, it helps decrease the force of the contraction and helps lower your blood pressure, all of these help your heart not work as hard as it was. your heart is like any other muscle, it gets tired when it works too hard, so this medication helps it so it doesnt have to work as hard to get the blood to the rest of your body. Hope this helped a little :)
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