PPT is about the heart structure

1. The mammalian heart
Chapter 1B

2. Learning objectives
Relate the structure and operation of the mammalian
heart, including the major blood vessels, to its function.
Know the cardiac cycle

3. The structure of the heart

5. Tendinous cords and valves

6. Foramen ovale

7. Heart sounds (lub-dub)
 Lub – closing of AV valves
 Dub – closing of SL valves

8. Cardiac cycle
 Contraction of cardiac muscle – systole
 Relaxation of cardiac muscle – diastole
 Main stages of cardiac cycle(takes nearly 0.8 seconds):
 1. Atrial systole
 2. Ventricular systole
 3. Diastole

9. Position of valves in cardiac cycle
AV valves SL valves
Atrial systole Open Closed
Ventricular systole Closed Open
Diastole Open Closed