3.1.5 control of the cardiac cycle
DESCRIPTION
3.1.5 Control of the Cardiac Cycle. L.O: to label and describe the 3 structures involved in controlling the cardiac cycle Starter: If systole means to contract and diastole means to relax , can you put these into the correct order of the cardiac cycle… Ventricular systole - PowerPoint PPT PresentationTRANSCRIPT
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3.1.5 Control of the Cardiac Cycle
L.O: to label and describe the 3 structures involved in controlling the cardiac cycle
Starter: If systole means to contract and diastole means to relax, can you put these into the correct order of the cardiac cycle…
• Ventricular systole• Diastole• Atrial systole
Diastole!
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Multiple-choice quiz
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Diastole
Diastole!
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Atrial Systole
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Ventricular Systole
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http://www.youtube.com/watch?v=xVofKdXOa4M
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What does a doctor hear when they listen to a patients’ heart?
Listening to a beating heart: lub-dub
The “lub” is caused bythe closing of the valves leading to the ventricles.
The “dub” is caused by the closing of the valvesleading out of the heart.
lub-dub,
The sound of a heartbeat is the sound of the heart valves.
lub-dub, lub-dub, lub-dub, lub-dub, lub-dub…
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Cardiac CycleStage Atrioventricular
valvesSemi lunar
valves
Diastole
Atrial Systole
Ventricular Systole
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Cardiac CycleStage Atrioventricular
valvesSemi lunar
valves
Diastole Open Closed
Atrial Systole
Open Closed
Ventricular Systole
Closed Open
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Blood Pressure• Systolic pressure is the
pressure at which the blood leaves the heart through the aorta.
• Diastolic pressure is the minimum blood pressure in the aorta.
• Blood pressure can be measured with a sphygmomanometer: first reading is systolic and second is diastolic then represented as a fraction.
Systolic Diastolic
< normal < 100 < 60
Normal 100-139 60-89
Borderline 140-159 90-94
Hyper-tension
>159 >94
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1.
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2.
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3.
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?
4.
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5.
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6.
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Control of the Cardiac CycleThree stages of the cardiac cycle are
controlled by three structures:
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Control of the Cardiac CycleThe three stages of the cardiac cycle are
controlled by three structures:
1. Sinoatrial node
2. Atrioventricular node
3. Bundle of His
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Control of the Cardiac Cyclehttp://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter22/
animation__conducting_system_of_the_heart.html
http://www.bbc.co.uk/learningzone/clips/the-human-heart/12225.html
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Past Exam Question Jan 2010
7 (a) The cardiac cycle is controlled by the sinoatrial node (SAN) and the atrioventricular node (AVN). Describe how. (5 marks)
Casualty Keywords!‘He’s tachycardic!’
A fast heart rhythm that originates in one of the ventricles of the heart. Can lead to ventricular fibrillation (a ‘quiver’ rather than a full contraction), asystole (no cardiac activity) and sudden death.
‘We need to defib NOW!’
Defibrillation consists of delivering a therapeutic dose of electrical energy to the affected heart with a device called a defibrillator. This should terminate the dysrhythmia, and allows the sinoatrial node of the heart to re-establish the correct rhythm.
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Keyword Quiz!Unjumble the keywords about the heart to solve the hidden message at the bottom of your sheet! Then solve the picture clue!
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