Human Circulatory system
Students need to be able to describe the human circulatory system, including the relationship with the gaseous exchange system. They will need to explain how the structure of the heart and blood vessels are adapted to their functions. Students need to know the components of blood and be able to explain how red blood cells, white cells, platelets and plasma are adapted to their functions.
Students often find it difficult to explain what is meant by double circulation, when delivering this topic ensure that students are able to clearly explain how blood is pumped to the lungs and body on each circuit and that it goes through the heart twice in each circuit. Asking students to give a two minute presentation on this (select different students at the start of different lessons), will help them articulate this
It is important when discussing/demonstrating the structure of the heart (for example in dissections) that students are shown the coronary arteries that supply the cardiac muscle, so that they appreciate that it is the blockage of these arteries that can cause heart attacks. There os often a misconception that it is the vessel which supply the heart which are blocked
The valves in the heart chambers are an important feature of the circulatory system so it is worth spending some time ensuring students appreciate the role that the valves play in the system, they should be a feature of any dissection.
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