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3.1.5 Control of the Cardiac Cycle

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

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3.1.5 Control of the Cardiac Cycle

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  1. 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!

  2. Multiple-choice quiz

  3. Diastole Diastole!

  4. Atrial Systole

  5. Ventricular Systole

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

  7. Listening to a beating heart: lub-dub What does a doctor hear when they listen to a patients’ heart? lub-dub, lub-dub, lub-dub, lub-dub, lub-dub, lub-dub… The sound of a heartbeat is the sound of the heart valves. 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.

  8. Cardiac Cycle

  9. Cardiac Cycle

  10. 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.

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

  18. Control of the Cardiac Cycle The three stages of the cardiac cycle are controlled by three structures: • Sinoatrial node • Atrioventricular node • Bundle of His

  19. Control of the Cardiac Cycle http://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

  20. 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!’ Afast 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.

  21. Keyword Quiz! Unjumble the keywords about the heart to solve the hidden message at the bottom of your sheet! Then solve the picture clue! n

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