[3E Bio] 6.3 Cardiac Cycle

6.3 Cardiac Cycle

Warming the cockles of your heart. ​

Poll

Are you ready for the most confusing part of the Sec 3 syllabus?

• Ever ready!

• Okay, bring it on.

• Not really but I will try.

• I am gone.

Labelling

Label the heart structures.

Drag labels to their correct position on the image

pulmonary artery

aorta

pulmonary vein

vena cava

left ventricle

right ventricle

right atrium

left atrium

Labelling

Label the valves.

Drag labels to their correct position on the image

bicuspid valve

tricuspid valve

aortic valve

pulmonary valve

Draw

Use red ink to show how oxygenated blood enter and leave the heart and blue ink to show how deoxygenated enter and leave the heart.

Multiple Select

Look at the animation CAREFULLY.

Which of the following is/are true? (More than one answers)

• The walls of atria pump consecutively with ventricle.

• The walls of left and right atria pump consecutively.

• The walls of left and right ventricle pump consecutively.

• The walls of atria pump first followed by ventricles.

• The walls of ventricles pump first followed by atria.

Match

Match the following events during cardiac cycle.

• atrial systole

• ventricular systole

• cardiac diastole

atrial muscles contract

ventricular muscles contract

both atrial and ventricular muscles rela

• atrial muscles contract

• ventricular muscles contract

• both atrial and ventricular muscles rela

Drag and Drop

What happens during atrial systole? (i.e. atrial muscles contract)?



Blood flows from ​

Placeholder

to ​

Placeholder

, resulting in the bicuspid and tricuspid valves to ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

atria

ventricles

open

close

arteries

Drag and Drop

What happens during ventricular systole? (i.e. ventricle muscles contract)?



Blood flows from ​

Placeholder

to ​​

Placeholder

, resulting in the ​semilunar valves to ​

Placeholder

and atrioventricular valves to ​

Placeholder

Drag these tiles and drop them in the correct blank above

close

arteries

ventricles

open

atria

Drag and Drop

What happens during cardiac diastole? (i.e. both atrial and ventricular muscles relax)?



Semilunar valves remain ​

Placeholder

to prevent backflow of blood back to the ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

close

open

atria

ventricles

Reorder

What are the steps to take when analysing the cardiac cycle graph.

• Compare only the pressure of TWO lines.

• Blood moves from higher pressure to lower pressure.

• EXCEPT when there is a valve to prevent backflow.

1

2

3

• 1
• 2
• 3

Multiple Choice

Compare pressure of atrium and pressure of ventricle. Which set of valves should you consider when opening and closing.

• atrioventricular valve (bicuspid valve)

• semilunar valve (aortic valve)

Multiple Choice

Compare pressure of ventricle and pressure of aorta. Which set of valves should you consider when opening and closing.

• atrioventricular valve (bicuspid valve)

• semilunar valve (aortic valve)

Multiple Choice

Compare pressure of atrium and pressure of aorta. Which set of valves should you consider when opening and closing.

• atrioventricular valve (bicuspid valve)

• semilunar valve (aortic valve)

• Makes not sense... because the two regions are not joined.

Multiple Choice

Which of the following sentence describes a change?

• Bicuspid valve closes.

• Bicuspid valve is closed.

Multiple Choice

Look at point W. Which two lines do we compare?

• Pressure of ventricle and pressure of atrium.

• Pressure of atrium and pressure of aorta.

• Pressure of ventricle and pressure of aorta.

Multiple Choice

Look at point W. How does the pressure change over time?

• Pressure of the atrium becomes higher than ventricle.

• Pressure of the ventricle becomes higher than atrium.

Multiple Choice

Look at point W. THEREFORE, how will the valve change?

• Bicuspid valve opens.

• Bicuspid valve closes.

• Aortic valve opens.

• Aortic valve closes.

Multiple Choice

Look at point X. Which of the following is true?

• Pressure of ventricle is now higher than atrium.

• Pressure of atrium is now higher than ventricle.

• Pressure of ventricle is now higher than aorta.

• Pressure of aorta is now higher than ventricle.

Multiple Choice

Look at point X. Pressure of ventricle is higher than atrium. Which of the following will happen?

• Therefore, blood flows from ventricle to atrium.

• Therefore, blood flows from atrium to ventricle.

• Blood CANNOT flow from atrium to ventricle.

Dropdown

Complete the sentence of what happens at Y.



Blood pressure of ventricle is ​

Select answer

blood pressure of aorta. Therefore, ​

Select answer

​

Select answer

.

Multiple Choice

What happens to the valve at Z?

• Bicuspid valve opens.

• Bicuspid valve closes.

• Aortic valve opens.

• Aortic valve closes.

Draw

Label ONE cardiac cycle.

Open Ended

How will the graph for the cardiac cycle be same AND different for the right side of the heart?