Your SlideShare is downloading. ×
The cardiac cycle 2
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

The cardiac cycle 2

1,292

Published on

Published in: Health & Medicine
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,292
On Slideshare
0
From Embeds
0
Number of Embeds
4
Actions
Shares
0
Downloads
0
Comments
0
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. The Cardiac Cycle Charlotte Richardson
  • 2. The cardiac cycleThis presentation goes through the stages of the cardiac cycle that occur in one full contraction of the heart.
  • 3. The cardiac cycleThere are four stages of the cardiac cycle: I. Isovolumetric contraction II. Ventricular ejection III. Isovolumetric relaxation IV. Ventricular filling
  • 4. The cardiac cycleBroadly the stages of the cardiac cycle can be divided into systole and diastole: I. Isovolumetric contraction Systole- when the ventricles II. Ventricular ejection are contracting III. Isovolumetric relaxation Diastole- when the IV. Ventricular filling ventricles are relaxingHere the cycle has been depicted as starting from the end of diastole when the ventricles are relaxed and filled with blood
  • 5. Phase 1: Isovolumetric ContractionThe left ventricle isfull of blood andbegins to contract.This causes thepressure in the leftventricle to increase.
  • 6. Phase 1: Isovolumetric ContractionOnce the pressure inthe left ventricleexceeds that of theleft atrium the mitralvalve will close.This is to preventblood from goingback into the leftatrium. Mitral valve closes
  • 7. Phase 1: Isovolumetric ContractionThe ventriclescontinue tocontract, but until theaortic valve opens thepressure in the leftventricle increaseswith no change involume- this isisovolumetric Isovolumetriccontraction. contraction
  • 8. Phase 2: Ventricular ejectionOnce the pressure inthe left ventricleexceeds that of theaorta the aortic valvewill open. Aortic valve opens
  • 9. Phase 2: Ventricular ejectionBlood then leaves Ventricular ejectionthe left ventricle intothe systemiccirculation via theaorta- ventricularejection
  • 10. Phase 3: Isovolumetric relaxationThe ventricles now Aortic valve closesbegin to relax oncethe blood has beenejected.When the pressurein the left ventriclefalls below that ofthe aorta the aorticvalve will close. Thisprevents bloodflowing back into theleft ventricle fromthe aorta.
  • 11. Phase 3: Isovolumetric relaxationAs the ventriclesrelax the pressurewill fall, but therewill be no change involume until themitral valve opens-this is isovolumetric Isovolumetericrelaxation relaxation
  • 12. Phase 4: Ventricular fillingOnce the pressure inthe left ventricle fallsbelow that in the leftatrium the mitralvalve will open.This then allows theventricles to fill withblood from the leftatrium, preparing Mitral valve opensthe ventricles foranother round of thecardiac cycle.
  • 13. The cardiac cycle- recapPhases of the cardiac cycle: I. Isovolumetric contraction Systole II. Ventricular ejection III. Isovolumetric relaxation Diastole IV. Ventricular filling
  • 14. The cardiac cycle- recap Ventricular ejection Aortic valve closes Aortic valve opens IsovolumetericIsovolumetric relaxationcontraction Mitral valve opens Mitral valve closes

×