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3.1.5 Pressure and Volume Changes in the Heart L.O: to interpret graphs on the cardiac cycle Starter: What animal has the highest blood pressure in the.

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Presentation on theme: "3.1.5 Pressure and Volume Changes in the Heart L.O: to interpret graphs on the cardiac cycle Starter: What animal has the highest blood pressure in the."— Presentation transcript:

1 3.1.5 Pressure and Volume Changes in the Heart L.O: to interpret graphs on the cardiac cycle Starter: What animal has the highest blood pressure in the whole wide world?

2

3 What’s the keyword?

4 Activity 1)Place your whiteboard on the table, use the rulers as axes around the whiteboard 2)Divide the whiteboard into the three stages of the cardiac cycle (start with atrial systole) 3)Use one piece of wool to show the pressure changes in the atria 4)Use a different coloured piece of wool to show the pressure changes in the ventricles Extension: Can you redo step 2 to think about how long each stage roughly lasts for?

5 Pressure Changes in the Heart Atrial Systole Diastole Ventricular Systole

6 Pressure Changes in the Heart Atrial Systole Diastole Ventricular Systole Atria pressure increases due to contraction

7 Pressure Changes in the Heart Atrial Systole Diastole Ventricular Systole Atria pressure increases due to contraction Atria pressure decreases as atria relax

8 Pressure Changes in the Heart Atrial Systole Diastole Ventricular Systole Atria pressure increases due to contraction Atria pressure increases as atria fill Atria pressure decreases as atria relax

9 Atrial Systole Diastole Ventricular Systole

10 Atrial Systole Diastole Ventricular Systole Ventricular pressure increases slightly due to passive filling

11 Atrial Systole Diastole Ventricular Systole Ventricular pressure increases slightly due to passive filling Ventricular pressure increases due to contraction

12 Atrial Systole Diastole Ventricular Systole Ventricular pressure increases slightly due to passive filling Ventricular pressure increases due to contraction Ventricular pressure decreases as ventricles relax

13 Atrial Systole Diastole Ventricular Systole Ventricular pressure increases slightly due to passive filling Ventricular pressure increases due to contraction Ventricular pressure decreases as ventricles relax Ventricular pressure increases slightly due to passive filling

14 Volume Changes 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Time (secs) Volume ofleftventricle(cm 3 ) 150 100 0 AtrialVentricular Ventricular SystoleSystole Diastole

15 Volume Changes 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Time (secs) Volume ofleftventricle(cm 3 ) 150 100 0 AtrialVentricular Ventricular SystoleSystole Diastole Thinking task! What do you think the line would look like?

16 Volume Changes 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Time (secs) Volume ofleftventricle(cm 3 ) 150 100 0 AtrialVentricular Ventricular SystoleSystole Diastole

17 Pressure Changes in the Heart

18 Match the letter on the graph to the following events Semi-lunar valves open Atrio-ventricular valves close, Semi-lunar valves close Atrio-ventricular valves open

19 atrio-ventricular valves close

20 semi-lunar valves open

21 atrio-ventricular valves close semi-lunar valves open semi-lunar valves close

22 atrio-ventricular valves openatrio-ventricular valves close semi-lunar valves open semi-lunar valves close

23 I can describe the three main stages of the cardiac cycle I can explain the how the heart is controlled by electrical impulses I can interpret pressure and volume graphs on the cardiac cycle Yes Complete sheet A. Did you score over 85% ? Use the AS revision guide page 40 and 41 to make notes No Yes Complete sheet B. What was your score? Can you see where you went wrong? Ask me for help

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