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 !

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

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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

Page 3: 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

Diastole

Diastole!

Page 4: 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

Atrial Systole

Page 5: 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

Ventricular Systole

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http://www.youtube.com/watch?v=xVofKdXOa4M

Page 7: 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

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…

Page 8: 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

Cardiac CycleStage Atrioventricular

valvesSemi lunar

valves

Diastole

Atrial Systole

Ventricular Systole

Page 9: 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

Cardiac CycleStage Atrioventricular

valvesSemi lunar

valves

Diastole Open Closed

Atrial Systole

Open Closed

Ventricular Systole

Closed Open

Page 10: 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

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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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.