aqa biology heart
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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 whole wide world?
What’s the keyword?
Activity1) 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?
Pressure Changes in the HeartAtrial
Systole DiastoleVentricular Systole
Pressure Changes in the HeartAtrial
Systole DiastoleVentricular Systole
Atria pressure increases due to contraction
Pressure Changes in the HeartAtrial
Systole DiastoleVentricular Systole
Atria pressure increases due to contraction
Atria pressure decreases as
atria relax
Pressure Changes in the HeartAtrial
Systole DiastoleVentricular Systole
Atria pressure increases due to contraction
Atria pressure increases as
atria fillAtria pressure decreases as
atria relax
Atrial Systole DiastoleVentricular
Systole
Atrial Systole DiastoleVentricular
Systole
Ventricular pressure increases slightly due to passive filling
Atrial Systole DiastoleVentricular
Systole
Ventricular pressure increases slightly due to passive filling
Ventricular pressure increases due to contraction
Atrial Systole DiastoleVentricular
Systole
Ventricular pressure increases slightly due to passive filling
Ventricular pressure increases due to contraction Ventricular
pressure decreases as ventricles relax
Atrial Systole DiastoleVentricular
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
Volume Changes
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Time (secs)
Volume of left ventricle (cm3 )
150
100
0
Atrial Ventricular Ventricular
Systole Systole Diastole
Volume Changes
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Time (secs)
Volume of left ventricle (cm3 )
150
100
0
Atrial Ventricular Ventricular
Systole Systole Diastole
Thinking task! What do you think the line would look like?
Volume Changes
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Time (secs)
Volume of left ventricle (cm3 )
150
100
0
Atrial Ventricular Ventricular
Systole Systole Diastole
Pressure Changes in the Heart
Match the letter on the graph to the following events
Semi-lunar valves openAtrio-ventricular valves close,
Semi-lunar valves closeAtrio-ventricular valves open
atrio-ventricular valves close
atrio-ventricular valves close
semi-lunar valves open
atrio-ventricular valves close
semi-lunar valves open
semi-lunar valves close
atrio-ventricular valves openatrio-ventricular valves close
semi-lunar valves open
semi-lunar valves close
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
Yes
Yes
Complete sheet A. Did you score over 85% ?
Use the AS revision guide page 40 and 41 to make notes
No
No
No
YesComplete sheet B.
What was your score?
Can you see where you went wrong? Ask me for help
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