Summary
OCR A-Level Biology Cardiac Cycle Summary
Handwritten Summary of all the A* content needed for Cardiac Cycle at Biology OCR A-Level.
[Show more]
Seller
Follow
Content preview
Carotid arteriesDiastole Heart relaxes chambers of
·
Aorta
the
:
,
venava heart fill ,
low
pressure in the arteries
Pulmonary vein
sino-atrial pulmonarytery
Systole Heart Chambers contract , blood leaves
·
:
node left atrium
Right
atrium
Atrio-ventricular
in the arteries
mode semilunar
value
I
the chambers ,
high pressure
atrioventricular left ventricle
Fetal heart Blood oxygenated
-
value
is in the
· :
Bundle of his
Rightentricle Purhyne tissue
e
septum
Purkyne fibers
placenta so a hole is present in the
septum
blood and lungs
so bypasses the ventricles
The Cardiac Cycle :
The sequence of'events in one full beat of the heart
1 .
Right side
:
Blood enters by the vena cava
Left side :
Blood enters by the
pulmonary vein
The SAN produces electrical impulses causing atrial
.
2 ,
systole
3 .
High atrial
pressure forces blood past the Ar values into the ventricles
↳
Non-conducting fibers prevent ventricular systole at this time
The AU conducts impulses through the bundle of his to the ventricles .
s The ventricles contract the Ar values shut and blood leaves via the arteries semilunar values
.
, , past
Right side Blood leaves via the
pulmonary artery the lungs to
:
Left side
:
Blood leaves via the aorta to oxygenate the rest of the
body
When Atrial
~
pressure is lower than
·
- semilunar
sure ventricular pressure sAuvalve Closes
- ·
When aortic pressure is
greater than
E trial pressure
centricular
pressure semi-lunar value closese
Ar value ventricular
-
Ar value
CloseS
·
opens
pressure
vice versa
time /S
ECG Electrocardiagram- shows the basic rhythm of the heat
:
R
down the
·- of
T
P Atrial G : Electrical impulses traver bundle his
systole
:
as R-s Ventricular
systole T Ventricular
repolarisation
: :
-
Heart Problems :
Bradycardia <60kpm Tachycardia: 120bpm Atrial fibrillation Abnormal heart
rhythm
: :
Ectopic Extra heartbeats outside of
:
the normal
rhythm
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller faithcortis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
84251 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now