Term
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Definition
| the volume of blood that flows through a tissue in any given time period |
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Term
| What is total blood flow equal to |
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Definition
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Term
| What happens to blood flow when cardiac output is increased |
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Definition
| blood flow to capillaries increases |
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Term
| What two factors influence the flow of blood |
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Definition
| pressure differences and resistance |
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Term
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Definition
| the force blood exerts on the vascular walls |
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Term
| How does blood pressure change with distance from the heart |
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Definition
| blood pressure decreases with increasing distance from the heart |
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Term
| What is systolic blood pressure |
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Definition
| the highest pressure in arteries during systole |
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Term
| What is diastolic pressure |
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Definition
| the lowest pressure in arteries during diastole |
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Term
| What is the blood pressure of the capillaries at the precapillary sphincters |
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Definition
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Term
| What does the blood pressure drop to in the venules |
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Definition
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Term
| What is the blood pressure value at the right atrium |
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Definition
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Term
| What is mean arterial pressure |
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Definition
| the average pressure in the arteries |
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Term
| What is the formula for mean arterial pressure |
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Definition
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Term
| What two factors does blood pressure depend on |
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Definition
| cardiac output, total blood volume |
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Term
| What is the relationship between cardiac output and blood pressure |
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Definition
| an increase in cardiac output causes an increase in blood volume |
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Term
| What is the relationship between blood pressure and total blood volume |
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Definition
| An increase in total blood volume increases blood pressure |
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Term
| What is resistance caused by |
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Definition
| the friction between blood and the vascular walls |
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Term
| What three factors effect resistance |
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Definition
| blood viscosity, total blood vessel length, diameter of lumen |
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Term
| How does the size of the lumen effect resistance |
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Definition
| the smaller the lumen the greater the resistance |
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Term
| How does blood viscosity effect resistance |
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Definition
| the thicker the blood the greater the resistance |
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Term
| What two conditions can cause increased blood viscosity |
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Definition
| polycythemia and dehydration |
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Term
| How does total blood vessel length effect resistance |
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Definition
| an increase in total blood vessel length increases resistance |
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Term
| What condition causes an increase in total blood vessel length |
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Definition
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Term
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Definition
| the volume of blood flowing back to the heart through systemic veins |
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Term
| What factors aid venous return |
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Definition
| venous valves, respiratory pump, skeletal muscle pump |
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Term
| What does skeletal muscle contraction do to veins and the blood in them |
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Definition
| it compresses the vein which helps to move the blood toward the heart |
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Term
| In the respiratory pump what happens during inhalation |
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Definition
| The diaphragm moves inferiorly which increases pressure in the abdominal cavity and compresses abdomimal veins helping to move the blood toward the heart |
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