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15 Cards in this Set

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What is the Ejection Fraction?
Volume of blood ejected during systole --> 0.67
Who has an elevated Ejection Fraction?
Athletes
Who has a lowered Ejection Fraction
Heart disease
What happens to the S/D when you increase the heart rate?
S: Lowers a lot
D: Lower a little bit
During the cardiac cycle what electrical event occur as you go from Diastole --> Systole?
Ventricular Depolarization
During the cardiac cycle what electrical event occur as you go from Systole --> Diastole?
Ventricular Repolarization
During the cardiac cycle what Acustical event occurs as you go from Diastole --> Systole?
Lub of "Lub-Dub"
During the cardiac cycle what Acustical event occurs as you go from Systole --> Diastole?
Dub of "Lub-Dub"
What is the order of flow in the capillaries?
Arterioles --> Capillaries --> Venules
Where is most of the blood volume (5L) contained in the CV system?
Veins: 75% and adjustable (e.g change in posture)
Arteries: 20 %
Capillaries: 5% or 1 cup
What are some special properties of Venis?
1. Distensible: i.e stretchable
2. you can hold ALL the blood in veins
3. Low pH (lactic acid)
4. cooler (heat transfer in skin)
Why is the pressure in the arteries relatively constant (~100 mmHg) up until the arterioles?
b/c the arteries are Large and have low resistance
Why is the Cross-Sectional area the greatest and the Velocity of blood flow lowest t the capillaries?
Allows for exchange via diffusion between blood and cells which requires time and a lot of surface area
What are some special properties of the different compartments in the heart?
Atria: thin walled, asymptomatic w/ arterial fibrillation, symptomatic @ high HR
Ventricles: Left is Thick and subject to higher pressures
Where are the valves located in the heart?
Left: Mitral valve --> aortic valve
Right: Tricuspid valve --> pulmonary valve