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((Mechanism:, 1. Pressure Diuresis, Definition: Increased urine output in…
- High arterial pressure → Increased renal perfusion → Increased glomerular filtration rate (GFR)
- Increased GFR → More fluid excretion (diuresis) → Reduction in blood volume → Decrease in blood pressure
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- Definition: Increased urine output in response to elevated arterial pressure.
- High arterial pressure → Increased renal perfusion → Increased GFR
- Increased sodium filtration → Reduced sodium reabsorption → Sodium excretion increases
- Reduced sodium reabsorption → Decreased blood volume → Decreased blood pressure
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- Definition: Increased sodium excretion in response to elevated arterial pressure.
- Fluid retention → Increased venous return → Increased stroke volume → Increased cardiac output
- Increased CO → Elevated arterial pressure
- Total Peripheral Resistance (TPR):
- Fluid retention → Increased blood volume → Increased arterial pressure → May increase vascular resistance
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- Kidneys excrete salt to balance pressure
- Sodium retention → Increased blood volume → Elevated pressure
- Sodium excretion → Decreased volume → Reduced pressure
- Increases extracellular fluid volume
- Increases blood volume and pressure
- Importance of Salt in Renal-Body Fluid Schema for Arterial Pressure Regulation*
- Effects of Angiotensin II:
- Vasoconstriction → Increased total peripheral resistance (TPR)
- Stimulates aldosterone release → Increases sodium retention → Increases blood volume → Elevated blood pressure
- Stimulates ADH release → Increased water reabsorption → Elevated blood pressure
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- Low renal perfusion → Juxtaglomerular cells release renin
- Angiotensin II Production:
- Renin → Converts angiotensinogen → Angiotensin I → Angiotensin II (via ACE)
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