Renin-Angiotensin-Aldosterone Feedback System And Tubular Reabsorption

Front 1

Function of renin-angiotensin aldosterone
system?

Back 1

Regulation of blood flow to and within the kidneys

Front 2

What triggers the renin-angiotensin aldosterone
system?

Back 2

changes in blood pressure and plasma sodium; monitored by the juxtaglomerular apparatus

Front 3

Effect of low plasma sodium?

Back 3

decreases water retention in the circulatory system ---> decrease in blood volume ---->

decrease in blood pressure

Front 4

Tubular reabsorption

Back 4

kidney reabsorbs essential substances and water from ultra filtrate and returns them to the
bloodstream

occurs in proximal and distal tubules and loop of henle

Front 5

Substances reabsorbed by active transport

Back 5

• glucose, amino acids, and salts

• chloride
• sodium

Front 6

Substances reabsorbed by passive transport

Back 6

• Water
• Urea
• Sodium

Front 7

angiotensin II

Back 7

Major effector peptide

displays opposing actions at different receptors (AT1 and AT2)

Front 8

AT1 receptor

Back 8

vasoconstriction, antinatriuresis, bp increase

Front 9

AT2 receptor

Back 9

vasodilation, natriuresis, bp decrease

Front 10

Maximal Reabsorptive Capacity

Back 10

maximal concentration of a substance
dissolved in the blood above which the
kidneys filter it into the urine

Front 11

Renal Threshold

Back 11

Describes the plasma concentration at which
active transport stops

Front 12

compare RT to plasma - what does it tell you?

Back 12

compare RT to plasma concentration can distinguish between excess solute
filtration and renal tubular damage

Front 13

Glucose renal threshold

Back 13

Glucose in the urine with a normal blood
glucose level suggests tubular damage and not
diabetes mellitus

Front 14

ADH function

Back 14

makes the walls of the distal convoluted tubule and collecting ducts permeable or impermeable to water, controlled by state of hydration of body

Front 15

Aldosterone

Back 15

regulates reabsorption of sodium in distal tubule, controlled by sodium levels in body

Front 16

High ADH levels

Back 16

Increased permeability ---->

increased reabsorption of water ---->

low volume, highly concentrated urine w/ HIGH specific gravity

Front 17

Low ADH levels

Back 17

Decreased permeability ---->

decreased reabsorption of water ---->

high volume of dilue urine with LOW specific gravity

Front 18

Peritubular capillaries

Back 18

• capillaries surrounding proximal tubules
• sight of removal of medications and foreign substances from blood to ultrafiltrate