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BSNC 1000 - PERFUSION QUESTIONS AND ANSWERS GRADED A+
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BSNC 1000 - PERFUSION
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BSNC 1000 - PERFUSIONRadius - answer biggest affect on blood flow through a vessel
Activation of Sympathetic NS - answer- Decreases vessel diameter
- Increases CO
- Increases TPR
Perfusion - answer The supply of oxygen to and removal of wastes from the cells and
tissues of the body as a result of the flow of blood through the capillaries.
Arterial System - answer Distributes blood and regulates pressure
Capillary beds - answer Transfer of materials between circulation and tissues
Venous System - answer Returns blood to heart volume reservoir
Scope of Perfusion - answer Optimal - Impaired - No Perfusion
Ischemia (cell injury) - answer Impaired perfusion
Infarction (cell death) - answerNo Perfusion
Blood Pressure - answerForce of blood against the walls of blood vessels
Systolic Pressure - answerBP during systole
- ventricles contract
Diastolic Pressure - answerBP during diastole
- ventricles relax
Pulse Pressure - answerSystole - Diastole (normal = 40-45 mmHg)
MAP = - answerCO x TPR
MAP ≈ - answerDiastolic Pressure - 1/3(Partial Pressure)
Blood Volume Influenced By: - answer-sodium ingestion and excretion
-renin/aldosterone
Vasoconstriction Influenced By: - answer- Autonomic NS
- Kidney renin/angiotensin
, - Adrenal medulla hormones
Cardiac Output Influenced By: - answer- BPM
- Volume of blood
Peripheral Resistance Influenced By: - answer- Vasoconstriction
- Vasodilation
- Local Factors (pH, hypoxia)
- Sympathetic stimulation of smooth muscle of vessel walls
- Blood viscosity
- Vessel radius
Vasodilation Influenced By: - answer- Autonomic NS
- Kidney: vasodilators
- Hormonal factors
Peripheral Resistance - answerForce that must be overcome to push blood through the
circulatory system
Blood Viscosity Decreases Because: - answer- Anemia: Load that the heart works
against is lower so TPR decreases
- Hypoproteinemia: Plasma proteins go down so blood is thinner so TPR decreases
What influences blood flow? - answer- Viscosity of blood (Increase = decrease in flow)
- Velocity of blood
- Vessel Radius
- Vessel Elasticity
What influences Viscocity? - answer- RBCs
- Hydration
- Proteins
What is the vessel radius mostly controlled by? - answerSympathetic NS
What controls do the regulation of BP and flow involve? - answer- Local
- Neural
- Hormonal
RAAS - answerRenin-Angiotensin-Aldosterone-System
Neurological Control - answer- BP rises
- Arteries stretched
- Baroreceptors increase firing rate
- Vasodilation
- Reduced heart rate
- BP decreases
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