* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Heart dissection - School
Document related concepts
Heart Dissection . Heart dissection • For this practical session you will need • Some newspaper so nothing goes on the bench • Scissors or scalpel • Good observational skills • Your sensible head on!!! Your heart probably looks like this. There is lots to be seen from the outside, so spend time examining it carefully. The creamy/white stuff on the outside is fat. This will give some protection for the heart, but too much is bad. Look at the faint lines on the outside, these are coronary arteries and veins, these supply the heart itself with blood. If they get blocked that can cause a heart attack. The flappy bits on the top are the 2 atria, this is where blood from the body and lungs comes into the heart Now feel the heart! Give it a squeeze! The browny red bit is muscle. See if you can feel the difference between the 2 sides. The left ventricle has thick muscle, so it can pump blood all around the body. The right ventricle has thinner walls because it only has to pump blood to the lungs (not far). Which is right, which is left?? • Make sure you know this before doing any cutting. • Between the right and left side is a wall of muscle, (interventricular septum) this is so the blood doesn’t mix. Blood on the left will contain oxygen, blood on the right won’t. Now the cutting! Look at the heart from the top to work out left/right Now the cutting!! • Actually this isn’t that exciting. • Try to cut the heart in half so that you can see both the right and left sides. Its tricky so take care!! Beware blood clots! Don’t worry, this will have happened after the animal died when the blood stopped flowing. Stringy bits? These are commonly called the heart strings. They are really strong and they stop the heart valves from turning inside out. Clearing up • Make sure that everything goes in the black bin bag • Check there is nothing on the bench • Wash your hands with Miss Boothman’s special soap. • Now complete the work. Copy and complete Heart dissection The heart I looked at was about as big as ______. Most of the heart is made of __________. On the outside there are arteries and veins which can cause a ________ ______ if they get blocked. There is some white coloured _____ on the outside which protects it. There are ______ sides to the heart, they are separated by a wall of _______. This stops the blood with oxygen mixing with the blood without oxygen. The _____ side of the heart is thicker because it has to pump blood all _________ the body. Extension Work/Homework • Write a letter to an older person to explain how their heart works and why they must look after it. Maybe use pictures?