Lecture 8 Flashcards
Describe the design of the mammalian cardiovascular system?
- four chambered heart
- blood flows in one direction
- arterial blood flows away from heart
- venous blood flows towards heart
- two pumps that lie in series
When the ventricles are relaxes what position of the AV valves in?
Open
When the ventricles are contracted what position are the AV valves in?
- closed
When the ventricles are dilated what position are the semilunar valves in?
- closed
When the ventricles are contracted what position are th semilunar valves in?
Open
What percent of cardiomyocytes are activated during each heartbeat?
100%
What re the characteristics of diastole?
- relaxation and falling pressure
What are the characyteristics of systole?
Contraction ad rising pressure
What is the “lub” sound?
AV valve shutting
What is the “dupp” sound?
Semilunar valves closing
Does atrial or ventricular systole come first?
Atrial
What are the main features of a blood pressure trace?
- systolic pressure is the highest point on the trace
- diastolic pressure is the lowest point of the trace
- pulse pressure is the difference between the highest and lowest points
- ## mean pressure is the average across the full cycle
What is hypotension?
Low blood pressure
What is hypertension?
High blood pressure
Is diastole or systole longer?
Diastole
