What’s inside a heart? Heart Dissection | We The Curious

January 7, 2020 0 By Bertrand Dibbert

Hello, I’m Ross Exton, and today we’ve
come to live lab to dissect a heart The reason we’re using a pig’s heart is because it’s a very similar size
and shape and works in a similar way to a human
heart. Your heart is a fist-sized lump of muscle which is
responsible a pumping a blood around your body the
heart sets Your heart sits in the centre your chest round about here what we can see are a few tubes sticking out of the top and these are the veins and arteries of the heart. Veins go into the heart and arteries go away from the heart so once
the blood has deposited the oxygen around the body
it is said to be deoxygenated so we need to pick up more oxygen from the
lungs going via them right hand side of the heart the first place we’re going to go is
into this vein him called the vena cava the blood comes through the vena cava
into this first chamber here, which is called an atrium this then contracts and pushes the blood
down into the second lower chamber called a ventricle. the ventricle then contracts pushing the
blood up through this artery going to the lungs called the pulmonary artery. so what we can see here are three things
which look a bit like pockets. These are called semi-lunar valves. Once the blood is pumped up so of it will fall back down due to
gravity. These pockets will fill up and then all push together to create a seal which prevents
any blood falling back into the heart The blood comes out of the
heart, goes round the lungs and picks up the
oxygen that it needs and then comes back for the left hand
side of the heart to go around the rest of the body. We’re going
to cut into pulmonary veins. So the freshly oxygenated blood comes into the left
atrium which is also this part here. This fills up
with blood then contracts pushing the blood down into
the left ventricle what we can see here is the contrast
between the left hand side of the heart and the right hand side. And the difference in the thickness of the muscle. The reason for
this is because the left hand side has got to
push that blood all around the body. What we
can see really clearly on this side of the heart is the valve which is preventing the blood going
backwards from the venticle into the atrium and these are the
heartstrings and even though they don’t look like
much these are the tendons which stop the valves from inverting as the heart contracts, pushing
the blood out of it. You might’ve heard the phrase of someone
tugging on your heart strings. And there’s a bit of truth to that saying,
because if someone is making your heart beat a little bit faster and they genuinely
are pulling on the heart strings a little bit harder What we can see in this ventricle are these patterns which look a little bit like the roots of a tree. As the blood comes down from the atrium
it then needs to turn around and go back up out of the heart. So to give a little bit a friction to slow it down, we’ve got these structures here and the final stop journey of the blood
as it goes through the heart is the last artery, called the aorta. The left ventricle beats, pushes that blood up though here So there you have it. A pig heart dissection. And if
you’d like to take a closer look at one of these why not come and join us and get stuck in, here in live lab. So there you have it, a pig heart dissec… oh my god!