The Cardiac Cycle and Heartbeat with Past Paper Questions

Okay, this has everything I think you need to know about the heart itself, and for a bit of extra help I've put in every past paper question I could find on the heart, if you find more tell me :) hope this is helpful!

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  • Created by: ErinMay
  • Created on: 23-03-13 21:30

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Slide 1

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The Heart
AQA BIOL1…read more

Slide 2

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Valve…read more

Slide 3

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Right Side (left as you look at it on the
first slide)
Pumps deoxygenated blood to the lungs.
Blood enters the right atria via the Vena Cava,
superior is above, inferior is below.
Blood passes through the tricuspid valve (right semi
lunar valve) into the ventricles.
Blood exits via pulmonary artery, to the lungs.
Blood passes through the right semi lunar valve and
the pulmonary valve respectively between each
stage.…read more

Slide 4

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Left Side (right as you see it on the
Pumps oxygenated blood to the body.
Oxygenated blood from the lungs enters via the
pulmonary vein.
Pumped from left atria into left ventricle via left semi
lunar valve.
Pumped from the left ventricle into the aorta via the
aortic valve.
Blood leaves via the aorta.
Aortic valve and Pulmonary valve can also be referred
to as the left/right atrio-ventricular valves.…read more

Slide 5

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The Heartbeat
A beating heart is said to be myogenic. Meaning self
initiating, it doesn't need a conscious thought to pump
it, it does it all by itself.
It starts with the sinoatrial node (SAN) sending out an
electrical impulse through the heart, which causes a
contraction of the atria.
The electrical impulses then travel through the atrio-
ventricular node (AVN) after about 0.1s.
The impulses then travel down the Purkyne Fibres to
the base of the heart, causing the ventricles to
contract, and push the blood out of the heart.…read more

Slide 6

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Why the delay between
contractions is important
If the ventricles and artia
contracted, it wouldn't allow for
time for blood to flow from the
atria to the ventricles, so
pressure wouldn't be maintained
and the whole heartbeat would
be completely inefficient and
would transfer very little to no
If you are asked this question in
the exam, to how it wont allow
time for the ventricles to fill.…read more

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