as pe lesson 14 cardiac cond 2013-14
DESCRIPTION
Cardiac conduction & the cardiac cycleTRANSCRIPT
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LESSON 14AS PE ANATOMY &
PHYSIOLOGY
Cardiac Conduction System &
Cardiac Cycle
James Barraclough
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Aims: Conduction System of Heart
Objectives:• ALL learners will be able to describe cardiac cycle (diastole & systole) via directed questioning and class based activities
• MOST learners will be able to explain the conduction system of heart through arranging into stages
• SOME learners will be able to evaluate how the conduction system & cardiac cycle are affected by exercise through making an information film
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Starter: Hangteacher
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Hangman prompts• Bundle of His• Purkinje fibres• Systemic circulation• Pulmonary circulation• Atria• Ventricles
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Activity 1: Conduction System of the Heart
Complete the quiz questions:
1. How does the heart innervate special muscle fibres?
2. What does myogenic mean?
3. What does the conduction system of the heart do?
4. What is the heart’s pacemaker called?
5. Using the picture on page 64 for reference draw a diagram of the route the electrical impulses takes through the heart and describe the process
15 minutes
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Quiz Answers1. By producing electrical impulses
2. Capacity of heart to generate own impulses
3. Spreads impulses through heart to enable it to contract
4. Sinoatrial (SA) node
5. Passage of electrical impulse through heart:• SA node in RA wall• spreads to fibres of RA fibres causing atria to contract,• passes to atrioventricular (AV) node acting as distributor• passes to bundle of His• branches into L & R Purkinje fibres & excites ventricles• 0.1 second delay from AV Node receiving stimulation to
distribution of action potential through ventricles• Crucial to allow atrial contraction before ventricular systole begins
so as much blood as poss can pass from atria to ventricles
http://www.youtube.com/watch?v=te_SY3MeWys
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Cardiac Cycle
Process of cardiac contraction &
blood transportation through heart
ACTIVITY 2: PUT THE SLIDES IN THE CORRECT ORDER
Shockwave
ANSWERS:
1, 7, 5, 3, 9, 4, 2, 6, 8
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ACTIVITY 3
Using info from activities 1 & 2, & any other resources
(textbooks, internet etc.) produce short film explaining
cardiac conduction &
cardiac cycle & evaluate how it changes during exercise
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Recap: Mind Map
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Homework: to be handed in & marked!!!
1. Describe how blood travels through the heart in the following stages of the cardiac cycle:• Diastole • Atrial systole• Ventricular systole
2. While exercising, a greater volume of blood is ejected during ventricular systole. Why is this beneficial to performance?
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Next Lesson...
Control & regulation of the heart:• Autonomous Nervous System (ANS)• Regulation during exercise