Cardiovascular Physiology I Flashcards
Know the pathway blood travel through the circulation ( deoxygenated)
capillaries, venules, veins, vena cavae, right atrium, right av valve, right ventricle, pulmonary valve, pulmonary trunk
Heart has 4 chamber
2 -atria(thinner less muscular walls )
2- ventricles (thicker, muscular walls, pump blood out of the body)
largest vein in the body
Vena cavae
The oxygenated blood returns to the heart via
pulmonary venules and veins
Know the pathway blood travel through the circulation ( oxygenated)
Lung(capillaries) , pulmonary vein, left atrium, left av valves, left ventricle, aortic valve, aorta, arteries, arterioles, back to capillaries,
What are waves of ECG and what is activities do they represent
measure electrical current created by depolarization of the heart. represent the depolarization or re-polarization of the atria or ventricles.
What are the cardiac cycle phases and what is happening during each
Depolarize=atria=P
repolarization=ventricle=T
depolarize & contract= ventricle= QRS
Understand the electrical pathways involved in one single heartbeat
-SA depolarizes
-Both atria depolarize and contract
-AV slowly depolarizes
-Waves of depolarizes travel down the Bundle of HIS
-wave travel up to the Purkinje Fiber
-Both ventricle depolarize and contract, beginning at the bottom of the heart and continue up to the top of the ventricle
vasoconstriction
describes a reduction in diameter of the vessels, when it shrink less blood flow
Vasodilation
an increase in the diameter of the vessel, when it expand more blood flow
Application of heat and cold
vasodilation/vasoconstriction
Heat = vasodilation
Cold = vasoconstriction
In what ways is the SA node the ‘‘peacemaker’’ and how do these cells differ from other cells in the heart
A specialized cluster of muscle cells in the upper portion of the right atrium. It automatically depolarizes
What drives changes in blood flow during active hyperemia ?
Most organs and tissues manifest an increase in blood flow (hyperemia) when their metabolic activity is increased, direct result of arteriolar dilation
How does an increase in metabolic activity change the heartrate and pulse strength ?
Increase heart rate (Tachycardia)
Increase pulse strength
Why is there a delay between a heartbeat and the pulse its creates away from the heart
distance,
Blood Vessel Compliance
Cardiac Output and Stroke Volume
Vascular Resistance
