Transition 2020 2362020 The Conduction System of the heart The Conduction system We are going to learn the step by step process of how a single heart beat occurs Leaning Outcomes Students will ID: 930467
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Slide1
L3
BTEC SPORT&A-Level PETransition 2020
23/6/2020
Slide2The Conduction System of the heart.
Slide3The Conduction system
We are going to learn the step by step process of how a single heart beat occurs.Leaning OutcomesStudents will identify the key components of the conduction system.Students will map the route of the cardiac impulse the key components of system.Students will apply the conduction system to the movement of blood around the heart/body (Cardiac cycle).
Slide4Guidance
On the next three sides there are the basic structures of the heart. I have given you 13 in total. You do not need to write these down but keep a score of how many you get?Keep going until you get 13/13
Slide5Structure of the heart
RIGHT VENTRICLE - A lower chamber containing de-oxygenated blood.
LEFT VENTRICLE - A lower chamber containing oxygenated blood.
LEFT ATRIUM - An upper chamber receiving oxygenated blood from the lungs.
The left side of the cardiac muscle has a thicker wall to allow the heart to contract with more force on the oxygenated side.
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Slide6Structure of the heart
PULMONARY ARTERY -
Carries deoxygenated blood from the heart to the lungs.
PULMONARY VEIN -
Returns oxygenated blood to the heart.
AORTA -
Oxygenated blood is pumped at high pressure from the heart to the body.
The more
efficient
the heart the greater the capacity to transport oxygen.
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Slide7Structure of the heart
SEPTUM -
The wall dividing the left and right sides of the heart.
TRICUSPID -
Prevent blood flowing back into the right atrium from the ventricle.
BICUSPID -
Prevent blood flowing back into the left atrium.
Other structures of the heart that enable a smooth functioning include:
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Chordae
tendineae
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Slide8Guidance
In the next three slides the key structures required for the heart to beat are introduced. From these slides and the video list the structures the cardiac impulse passes trough in order. E.g.Sinoatrial node………………. nodeAtrial walls
Slide9The electrical impulse begins at the pacemaker: a mass of cardiac cells known as the
sino
-atrial node (S.A. node).
As the impulse is emitted, it spreads to adjacent interconnecting fibres of the atrium, which causes the atria to contract.
Cardiac conduction system
Slide10It then passes to another specialised mass of cells called the atrioventricular node (A.V. node)
The A.V. node acts as a distributor and passes the action potential to the Bundle of His.
Cardiac conduction system
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Slide11This action potential filters to the branching Purkinje fibres, spread the excitation throughout the ventricles.
There is a delay of about 0.1 second from the time when the A.V. node receives stimulation, to when it distributes action potential through the ventricles.
Cardiac conduction system
Slide12Video link
Copy across the link to youtube to learn more:youtube.com/watch?v=fZT9vlbL2uA
Slide13Task
Using the following slide and the video you’ve just watched go back to your diagram and add what will happen to the blood in the heart as a result. E.g.Sinoatrial nodeAtrial wallsAV node
Blood is pushed through the right and left atrium through the tricuspid (right) and bicuspid (left) valves into the left and right ventricle.
Slide14Summary of the
Conduction SystemThe heart is myogenic – it generates/controls its own electrical impulse called the CARDIAC IMPULSE.The cardiac impulse is initiated from the sinoatrial (SA)node in the right atrium.Impulse passes through right and left atrium walls to atrioventricular (AV) node.This causes both atria to contract termed ‘atrial systole’.The AV node delays the cardiac impulse allowing ventricular diastole.
AV node then conducts the impulse down through the bundle of his located in the septum where it splits the impulse in two. Ready to distribute through each ventricle.
Bundle branches then carry the impulse to the base/apex of the heart.
Impulse travels up around ventricle walls via
purkinje
fibres.
Causing both ventricles to contract termed ventricular systole.
Cycle continues, SA node initiates the next cardiac impulse.
Slide15Exam question
Slide16Mark your answer using the mark scheme below
Slide17Summary
Slide18Hopefully along with your exam answer you have produced something or are able to complete the following slides.
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Students will identify the key components of the conduction system.
Learning Outcomes/task answers
Slide20Learning Outcomes/task answers
Students will map the route of the cardiac impulse the key components of system.Sinoatrial nodeAtrial wallsAv nodeBundle of hisBundle branches
Pukinje fibres
Ventricle walls
Slide21Students will apply the conduction system to the movement of blood around the heart/body (Cardiac cycle).
Blood is pushed through the right and left atrium through the tricuspid (right) and bicuspid (left) valves into the left and right ventricle.Blood is pushed out of the right and left VENTRICLES through the pulmonary (right) and aortic (left) valves to the body (left) and the lungs (right).