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;

circulation animation#

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)