Assignment # 5
CV Physiology
Due Thurs. March 6th
Name__________Ilan Leas
_____________________
1.
Describe what
happens to the AV and Semilunar valves during ventricular
systole
.
Also explain why
these valves “behave” (i.e. open or close) this way
during this phase of the cardiac cycle (2 pts).
During the ventricular systole, the AV valves close because of the rapidly rising
pressure.
When the pressure in the ventricle exceeds the pressure in the large arteries,
the SL valves are forced open and blood is expelled from the ventricles into the aorta
and pulmonary trunk.
These valves open or close based on pressure.
2.
On a normal electrocardiogram, there are visible P, QRS, and T waves.
Describe
the electrophysiological “events” that cause each.
Which normal
electrophysiological “event” of the cardiac cycle is not observed/recorded on an
electrocardiogram (4)?
P wave = Depolarization wave from the SA node through the atria.
QRS waves = Results from ventricular depolarization and precedes ventricular
contraction.
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- Spring '08
- Brubaker
- #, 2 pts, ventricular systole, cardiac autorhythmic cells
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