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Cardiac Cycle Poster

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2024/2025 Written for academic year
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OCR
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Exchange and Transport
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An in-depth, colourful poster of the cardiac cycle, showing the structure of the heart and the process of the cardiac cycle. Includes the step-by-step process of the initiation and control of the heart, plus a diagram and explanation of the PQRST structure, and a labelled diagram of the pressure changes in the heart throughout the cardiac cycle. Poster made in Canva.

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The Cardiac Cycl
Semilunar valves




R Vena cava
Aorta




Pulmonary artery



PQRST = 1 cardiac cycle
P = atrial systole
caused by the depolarisation of the atria,
resulting in atrial contraction (systole)

QRS = ventricular systole
caused by the depolarisation of the ventricles,
which results in ventricular contraction Sino-atrial node
(systole). This is the largest wave because the
ventricles have the largest muscle mass (SAN)
T = diastole
caused by the repolarisation of the ventricles,
which results in ventricular relaxation (diastole) Right atrium


Tricuspid valve
(atrioventricular valve)



Ventricular
systole
Blood forced
out of
Aortic
Blood forced
ventricles
into aorta
pressure
Ventricular
pressure
Right
Ventricles
empty ventricle B
All blood
forced into
ia l
Atrioventricular node
ventricles Atr re
ssu (AVN) Apex
pre Diastole
Atrial Atrium begins
systole filling with blood




Stages of the Cardiac Cycle: Initiation
1. The sino-atria
1. The atria and ventricles relax at the same time
the wall of the
(diastole) wave of depol
2. The internal volume of the heart increases as contract.
blood flows in 2. An area of non
depolarisation
3. Blood flows into the atria from the vena cava and

ventricles.

Document information

Study Level
A/AS Level
Subject
Biology A
Uploaded on
May 27, 2025
Number of pages
1
Written in
2024/2025
Type
Other
Person
Unknown
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Browse related subjects

Subjects

  • heart
  • cardiac
  • cardiac cycle
  • heart cycle
  • coordination of the heart
  • structure of the heart
  • heart structure

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