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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 - PowerPoint PPT Presentation
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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!
Multiple-choice quiz
Diastole
Diastole!
Atrial Systole
Ventricular Systole
http://www.youtube.com/watch?v=xVofKdXOa4M
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…
Cardiac CycleStage Atrioventricular
valvesSemi lunar
valves
Diastole
Atrial Systole
Ventricular Systole
Cardiac CycleStage Atrioventricular
valvesSemi lunar
valves
Diastole Open Closed
Atrial Systole
Open Closed
Ventricular Systole
Closed Open
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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2.
3.
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Control of the Cardiac CycleThree stages of the cardiac cycle are
controlled by three structures:
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
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
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.
Keyword Quiz!Unjumble the keywords about the heart to solve the hidden message at the bottom of your sheet! Then solve the picture clue!