/sci/ - Science & Math

>The heart is located in the middle of the chest between the lungs behind the sternum

Wait... WHAT??? The heart used to be located on the left hand side. I even remember there being a rare medical condition where some people had their heart on the right hand side. But now apparently the heart has always been in the middle of the chest??? The FUCK

/sci/, YOU KNOW WHAT TO DO

Heart.

Hello /sci/, the last thread went excellently (and is awaiting archiving, I believe). Let's do this again.

This thread is a knowledge thread. You type up stuff about any subject you choose. I'll be copypastaing my posts from the first thread.

I'll talk about heart attacks.

Now, you guys know that a heart attack is bad. To understand exactly what's going on, let's talk about the heart. The heart, like all muscles, needs a blood supply. You may be wondering "Well, blood goes through the heart all the time. Problem solved". However, there are two reasons why that's wrong. First off, the right atrium and ventricle both have deoxygenated blood in them, so obviously that's not going to help. Secondly, the blood in that case would only help the endocardium, a thin layer of tissue on the inside of the heart. The heart is not just one giant muscle. It's made of fat, muscle, and epithelial tissues. All of those need blood. Now, as blood leaves the aorta, there are three aortic sinuses that are on the insides of the aortic valve. Two of those become coronary arteries (I don't know about the third) that supply blood to the muscles and everything else in the heart. These feed into the cardiac veins, which ends up in the right atria.

Sup /sci/? How about we just have a knowledge thread. Show off what you know by typing up stuff on a subject of your choosing.

I'll talk about heart attacks.

Now, you guys know that a heart attack is bad. To understand exactly what's going on, let's talk about the heart. The heart, like all muscles, needs a blood supply. You may be wondering "Well, blood goes through the heart all the time. Problem solved". However, there are two reasons why that's wrong. First off, the right atrium and ventricle both have deoxygenated blood in them, so obviously that's not going to help. Secondly, the blood in that case would only help the endocardium, a thin layer of tissue on the inside of the heart. The heart is not just one giant muscle. It's made of fat, muscle, and epithelial tissues. All of those need blood. Now, as blood leaves the aorta, there are three aortic sinuses that are on the insides of the aortic valve. Two of those become coronary arteries (I don't know about the third) that supply blood to the muscles and everything else in the heart. These feed into the cardiac veins, which ends up in the right atria.

To be continued (fuck you field too long).