Circulatory System
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Transcript of Circulatory System
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Cardiovascular System
Assistants of PhysiologyPhysiology Department
Medical Faculty, Hasanuddin University
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Circulatory System
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The Distribution of Blood in Cardiovascular System
1. Heart (7%)
2. Systemic Arterial System (13%) : Aorta : 2% Elastic Arteries : 4% Muscular Arteries : 5% Arterioles : 2%
3. Pulmonary Circuit (9%) : Pulmonary Arteries : 3% Pulmonary Capillaries : 2% Pulmonary Veins : 4%
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4. Systemic Capillaries (7%)
5. Systemic Venous System (64%) : Large Veins : 18% Large Venous networks
(liver, bone marrow, skin) : 21% Venules and medium-sized veins : 25%
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Arterial System
AP = CO x TPRAP = Arterial Pressure
CO = Cardiac Output = SV X HR
TPR = Total Perifer Resistance
TPR is influenced by : Viscosity Vascular resistance
- Vessel Length - Vessel Diameter Turbulence
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Circulatory Regulation
Short-term Regulation
Medium-term Regulation
Long-term Regulation
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Medium-term Regulation
Increased blood volume extravasasi-Transudation- Exudation
Decreased blood volume intravasasi (transcapillary refill/ autotransfution)
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Long-term Regulation
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Venous System
Characteristic : larger diameter valves distensibility compliance capasitance vessel
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Venous Pressure : Central Venous Pressure Peripheral Venous Pressure
Increase of CVP :
Valsalva’s Manouver
Decreased of CVP :
Hypovolemic Shock
Expiration
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Central Venous Pulsation
a wave : Atrial kick c wave : ventricular contraction v wave : Tricuspid valve’s
closing x descent : Rapid Filling y descent : Atrial relaxation
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VENOUS RETURN
Venous return influenced by : Body Position Muscle Pump Thoracic Pump CVP (central venous pressure) Stroke Volume (SV) etc
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MICROCIRCULATION
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AUTOREGULATION
Myogenic theory
- Transmurral pressure
- Longitudinal Pressure Metabolic theory
- Decrease of oxygen
- Increase of CO2
- Decrease of pH
- Vasodilators accumulation
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AUTOREGULATION
Hyperemia :
- Active hyperemia
- Reactive hyperemia
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STARLING’S FORCE
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STARLING’S FORCE
Filtration Rate :
K {( Pc – Pi ) – ( c - i )}
K : Permeability coefficient
Pc : Capillary Hydrostatic pressure
Pi : Interstitial Hydrostatic pressure
c : Capillary Oncotic Pressure i : Interstitial Oncotic Pressure
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OEDEMA
Oedema consist of : Interstitial oedema Intercelluler oedema
Mechanism of Interstitial Oedema : Hydrostatic Pressure Oncotic Pressure Obstruction of Lymphatic System
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HYPOVOLEMIC SHOCK