Mammalian Heart Structure and Cardiac Cycle

Based on OCR exam board. May be useful for Edexcel and AQA aswell. Hope you find it useful and please comment if there are any mistakes!

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  • Created by: JessicaB
  • Created on: 17-11-11 19:51

1. What is the wall of muscle which separates the ventricles called?

  • Septum
  • Aorta
  • Atrium
  • Vena Cava
  • Sternum
1 of 18

Other questions in this quiz

2. What is the role of a heart?

  • To oxygenate blood
  • Produces glucose for respiration
  • To create pressure to pump blood around the body
  • Site of respiration/to create energy

3. The right ventricle has a thicker wall than the left ventricle

  • False
  • True

4. Deoxygenated blood enters the heart through the...

  • Aorta
  • Coronary Arteries
  • Vena Cava
  • Pulmonary Artery
  • Pulmonary vein

5. The heart is divided into how many chambers?

  • 4
  • 2
  • 6
  • 3
  • 5



Brilliant !!

Aishah Khan

Pretty cool


Tommy Pallett


Just so you are aware, question 12 regarding the sound made by the hear "lub" is wrong: this sound is not produced by the left ventricle contracting by by the sudden closure of the atrioventricular valves. The second sound is therefore created by the sudden closure of the semilunar valves. The contraction of muscle does not contribute to the sounds produced by the heart.


OOOPS! Yes you are right. I did know this but must have forgotten to click on the different radio button. I do apologise. :)


Im not sure about a question. The questions is

During which stage of the cardiac cycle is the volume of blood inside the ventricles is at it's lowest?

I put diastole because at this moment blood is entering the atrium therefore no blood is in the ventricles.

But the answer given is actually ventricular systole but at the beggining of systole the volume of blood is at its maximum compared to diastole.

Could you please explain thnx.


End-systolic volume (ESV) is the volume of blood in a ventricle at the end of contraction or systole. ESV is the lowest volume of blood in the ventricle at any point in the cardiac cycle. In diastole, the blood flows through the atria and then through the atrioventricular valves into the ventricles. I know other exam boards teach that it is the beginning of diostole. This question was based on my OCR textbook.


I will change answers so it is simplified though. Thankyou for pointing it out i can see your confusion.

Former Member

Thanks! :)

Lewis McKenny.



A popular and thought provoking quiz on the cardiac cycle which has promoted much debate about certain answers and has been helpfully modified by the original author to make it as straightforward as possible. This would be useful for any student studying the cardiac cycle for their specification.

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