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18 Cards in this Set
- Front
- Back
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Cardiovascular System function |
-Transports: oxygen, CO2, Fuel hormones -Temp regulation -Heat dissipation -Heat conservation -Fight Infections ----White Blood Cells |
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Blood Flows from... and is determined by |
High pressure to low pressure -determined by ----Volume of blood ---Size of chamber ---Contraction force |
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Function of blood valves |
One way valves that open and close due to pressure Moves blood in one direction |
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Heart Generalizations |
Atria - Recieves Blood Ventricle - Pumps out blood Right side - Oxygen poor blood Left Side - oxygen rich blood |
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2 Types of Circulation |
Systemic Pulmonary |
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Contraction of the heart starts at... |
SA node of right atrium (pacemaker) -Causes atrial contraction |
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Atrial depolarization transports to ventricles via the...... |
AV node --connected by bundle branches and purkinje fibers |
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How is heart contraction measured |
Measured by electrocardiogram (ECG) |
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Explain the electrical activity of the heart |
--Cardiac fibers are intertwined by intercalcated discs they allow electrical transmission to leak easily -After 1 cell depolarizes to contract, all connected cells depolarize and contract as a unit --The heart is autorythmic (100bpm) |
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Explain the Cardiac Cycle |
-It is all events associated with blood glow to the heart ----Electrical, Pressure, and Volume changes occur |
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What is diastole |
Relaxation |
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What is systole |
Contraction |
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Reading an ECG |
P-Wave - atrial depolarization ---Squeezes blood into ventricles ---P to Q is delay as stimulus travels through AV bundle QRS Complex - Ventricle depolarization --Atria repolarization masked by QRS T-Wave - Ventricle repolarization ---Slower, wave is more spread out |
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Stages of a heart beat (just the steps) |
Phase I - Ventricular Filling Phase IIa - Isometric Ventricular Contraction Phase IIb - Ventricular Ejection Phase III - Isometric Relaxation |
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Explain Phase I of HB |
-Ventricle Relaxed - minimum amount of blood -Blood flows into atrium -Once pressure is greater in atrium than vent. - AV Valves Open (70% of blood goes into ventricle) Atrial contraction squeezes out the remaining 30% of blood Ventricle is at max volume (EDV) |
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Phase IIa of HB |
First Phase -ventricular contraction pushes AV valves closed -doesnt create enough pressure to open semilunar valve (blood has nowhere to go) Pressure in ventricle > atrium and Pressure in aorta and pulmonary a. > ventricle Closing of AV valve is first heart sound Pressure in ventricle builds with the contraction |
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Phase IIb of HB |
-as ventricle pressure rises and exceeds pressure of aorta and pulmon. artery. ----semilunar valves open and blood is ejected -pressure continues increase with contraction ----volume decreases as blood flows out into aorta/pulm.artery -Only 2/3rds of ventricle is ejected at rest |
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Phase III of HB |
Volume of blood left at end of Ventricular contraction is ESV Ventricles relax, lowering the pressure Once the pressure falls below the pressure of aorta and pulm. artery, semilunar valves close |
