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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Presentation transcript:

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

What does a doctor hear when they listen to a patients’ heart? Listening to a beating heart: lub-dub The “lub” is caused by the closing of the valves leading to the ventricles. The “dub” is caused by the closing of the valves leading out of the heart. lub-dub, The sound of a heartbeat is the sound of the heart valves. lub-dub, lub-dub…

Cardiac Cycle StageAtrioventricular valves Semi lunar valves Diastole Atrial Systole Ventricular Systole

Cardiac Cycle StageAtrioventricular valves Semi lunar valves DiastoleOpenClosed Atrial Systole OpenClosed Ventricular Systole ClosedOpen

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. SystolicDiastolic < normal< 100 < 60 Normal Borderline Hyper- tension >159>94

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Control of the Cardiac Cycle Three stages of the cardiac cycle are controlled by three structures:

Control of the Cardiac Cycle The 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 Cycle hill.com/sites/ /student_view0/chapter22/animation__conducting_system_ of_the_heart.html

Past Exam Question Jan (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!