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Blood Pressure

Maintaining blood pressure

State the pressure gradients from the aorta to capillaries 60mmHg (90mmHg to 30mmHg)
State the pressure gradients across the capillary bed 15mmHg (30mmHg to 15mmHg)
State the pressure gradients from the capillaries to the heart 15mmHg (15mmHg to 0mmHg)
State the formula for flow Flow = difference in pressure / resistance
Factors affecting blood flow Sympathetic nerves, hormones and local factors i.e. metabolic and endothelial
Factors affecting blood pressure Blood volume, total peripheral resistance, cardiac output
Mean arterial pressure = diastolic pressure + 1/3 pulse pressure
Metabolic controls that dilate blood vessels decrease O2, increase CO2, decrease pH, increase prostaglandins, increased osmolarity, increased nitric oxide
Metabolic controls that constrict blood vessels increase endothelin
Nerves that constrict the blood vessels Sympathetic
Hormones that constrict the blood vessels alpha receptors, ADH, angiotensin II
Hormones that dilate the blood vessels beta receptors, ANP (atria natriuretic peptide)
Created by: 813890255



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