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Single Vs Double Circulation…
The heart and cardiac cycle…
(d) describe, with the aid of diagrams andphotographs, the external and internal
structure of the mammalian heart;(e) explain, with the aid of diagrams, the
differences in the thickness of the walls ofthe different chambers of the heart in terms
of their functions;(f) describe the cardiac cycle, with reference to the action
of the valves in the heart;
Functions of valves…
Cardiac Cycle Animation
• http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter22/animation__the_cardiac_cycle__quiz_1_.html
Pressure Changes during the Cardiac Cycle
In which part of the heart…..• Will the pressure rise the highest?• Will change the most?• Is pressure higher during SYSTOLE or
DIASTOLE?
The Cardiac Cycle1. Blood enters …… atrium from the ………..
Vein2. Atrium wall contracts3. ………. Valve opens4. Blood flows into left ……….5. Bicuspid valve ………6. Ventricle contracts and pushes blood
through ………… valve into the ………..7. Blood enters right atrium from the …………8. Atrium wall contracts9. ……….. Valve opens10.Blood flows into right ventricle11.Tricuspid valve shuts12.Ventricle wall contracts and pushes blood
through the ………… valve into the ………… artery
CARDIAC CYCLE
Semi lunar valve open
Atrial systole
AV valve open
Atrial diastole
Ventricular systole
AV valve closed
Semi lunar valve closed
Semi lunar valve open (A)
Atrial systole (D)
AV valve open (F)
Atrial diastole (G)
Ventricular systole (C)
AV valve closed (E)
Semi lunar valve closed (B)
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