Conduction Pathway in Heart

1
(No Transcript)
2
(No Transcript)
3
(No Transcript)
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
(No Transcript)
8
(No Transcript)
9
(No Transcript)
10
(No Transcript)
11
Conduction Pathway in Heart
T tubule
T tubule
T tubule
T tubule
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
(No Transcript)
16

• Atria ventricles relaxed
• All valves closed
• Isovolumetric ventricular relaxation

• Blood entering atria from systemic and pulmonic
  circulations
• Increasing pressure in atria
• I

• Ventricular pressures decrease
• Semilunar valves close
• Second heart sound

• Pressure in atria exceeds ventricular pressures
  and A-V valves open
• Blood moves into ventricles
• Passive ventricular filling
• Slight increase in ventricular pressure

• Blood moves into pulmonary trunk aorta

Cardiac Cycle

• Ventriclular pressure rises rapidly
• When ventricular pressure exceeds aortic
  pulmonic pressures semilunar valves open

• SA node fires P wave
• Atria depolarize and contract
• Active ventricular filling

• Ventricles contract
• All valves closed
• Isovolumetric ventricular contraction

• Pressure in atria drop
• AV valves close
• First heart sound
• Depolarization spread to ventricles QRS

17
(No Transcript)
18
(No Transcript)
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22
(No Transcript)
23
Phosphodiesterase 3 degrades cAMP
24
(No Transcript)
25
(No Transcript)
26
(No Transcript)
27
(No Transcript)
28
According to Poiseuille's law, blood flow is
directly related to the pressure difference
between the two ends of a vessel and is inversely
related to the resistance to blood flow through
the vessel.The picture shown the the left
represents the systemic flow from and to the
heart. Its shows the average pressure and driving
force of blood flow.
29
(No Transcript)
30
(No Transcript)
31
(No Transcript)
32
(No Transcript)
33
(No Transcript)
34
(No Transcript)
35
(No Transcript)
36
(No Transcript)
37
(No Transcript)
38
(No Transcript)
39
(No Transcript)
40
(No Transcript)
41
(No Transcript)
42
(No Transcript)
43
(No Transcript)
44
(No Transcript)
45
(No Transcript)
46
(No Transcript)
47
(No Transcript)
48
(No Transcript)
49
(No Transcript)
50
(No Transcript)
51
(No Transcript)