Renal Physiology Flashcards
Ammonium phosphate magnesium stone
Proteus mirabilis
Staghorn calculi
Renal circulation
Renal artery -> segmental artery -> interlobar artery -> arcuate artery -> interLOBULAR artery (otherwise known as Cortical Radiate/Radial Artery) -> afferent arteriole -> glomerular capillaries -> Efferent arteriole -> Peritubular Capillaries / Vasa Recta -> interLOBULAR vein -> arcuate vein -> RENAL VEIN
Only capillaries in the human body that leads to arteriole stand not venules
Glomerular Capillaries
Countercurrent exchange
Vasa Recta
Capacity of the urinary bladder
600 ml
Urge to urinate
150 ml (25%)
Reflex contraction
300 ml (50%)
Bladder muscle
Smooth muscle responsible for stretch activating Ca channel
Detrussor muscle
Internal urethral sphincter
Involuntary
External Urethral sphincter
Voluntary
Functional & Structural unit of Kidney
Nephron
Basic parts of the kidney from lateral to medial
Capsule Cortex Medulla Renal Papilla Renal Calyces (Minor & Major) Renal Pelvis
RBC size
6 - 8 macro meters
Visceral epithelium
Podocytes
Parietal epithelium
Bowman’s capsule
Albumin cannot be filtered
protein urea 3.5 g/day
Damage basement membrane
Nephrotic syndrome
75% of nephrons
Located at renal cortex (more vascular)
Short LH
Peritubular Capillaries
Cortical Nephrons
25% of nephrons
Located at corticomedullary junction
Long LH
Vasa Recta
Juxtamedullary Nephrons
Secretes Renin
Found at the walls of the Afferent Arterioles
JG cells / Glomerular cells of the Afferent Arterioles
Found in the walls of the Distal convoluted tubule
Monitor Na conc. In the DT
Macula Densa
Contains foot processes
Filtration slit
cells of Capillary endothelium
Podocytes
(+) micro villi
Workhorse of Nephron
Require ATP - requires O2
PCT
66% reabsorbed - Na, K, H2O
100% reabsorbed - glucose, AA
Secrete H
Prone to ischemia
PCT
Carbonic Anhydrase Inhibitor
PCT
S/E of Carbonic Anhydrase Inhibitor
Metabolic Acidosis
Permeable: H20
Impermeable: solute so
Descending Limb of Loop of Henle
Permeable: solute so
Impermeable: H20
Ascending Limb of Loop of Henle
Loop diuretic S/E
Hypokalemia
Alkalosis
Hypokalemia
Na K Cl cno transport
Absorb NaCl
Contributes to counter current of LH
Diluting Segment of Nephron
TAL
Permeable: Solutes
Impermeable: H20
Cortical Diluting Segment
Found in macula Densa
Early Distal Tubule (1st part)
Principal cells & Intercalated cells - stimulated by Aldosterone Hormone
Late Distal Tubule (2nd part)
Thiazides
Distal Tubule
S/E of Thiazides
Hypokalemia Alkalosis Hypercalcemia Hyperglycemia Hyperuricemia Hyperlinked is
ADH - Aquaporin type 2
Greater water reabsorption
Urine volume low
Urine conc. High
Collecting duct
Dec ADH - Dec Aquaporin
Urine volume - increase
Urine conc - decrease
Potassium sparing diuretics
Collecting duct
Aldosterone antagonist
Collecting duct
S/E of Potassium Sparing diuretics
Hypercalcemia
S/E of Aldosterone Antagonist
Ex. Spiranolactone
Gynecomastia
Movement from Glomerular Capillaries to Bowman’s Capsule
Glomerular Filtration
Movement from tubules to interstitium to Peritubular capillaries
Tubular Reabsorption
Movement from Peritubular Capillaries to Interstitium to Tubules
Tubular Secretion
Excretion = (amount filtered) - (amount reabsorbed) + (amount secreted)
Excretion
Cardiac function marker
Ejection Fraction
Renal blood flow
25% of cardiac output
Preferential constriction of efferent Arterioles
Angiotensin II
Estimated by PAH clearance
Renal Plasma Flow (RPF)
Fraction of renal plasma flow that is filtered
Filtration fraction
Afferent Arteriole: Dilate
Increase effect on GFR
Afferent Arteriole: Constrict
Decrease effect on GFR
Efferent Arteriole: Dilate
Decrease
Efferent Arteriole: Constrict moderately
Increase
Efferent Arteriole: Constrict Severely
Decrease
GC Hydrostatic pressure: increased
Increase
GC Oncotic Pressure: increased
decreased
BS Hydrostatic Pressure: Increased
Decrease
If: increased
Increase
Which of the following are actions of the hormone renin?
Converts angiotensin open to angiotensin I
Increased Renin due to sympathetic action from a gunshot wound to the abdomen will eventually lead to which of the following. Effects in the kidney?
Decreased renal plasma flow
Which of the following would cause an increase in both glomerular filtration rate and renal plasma flow?
Dilation of the Afferent arteriole
All of the following. Would cause a decrease in the GFR except
B. Constriction o the efferent arteriole (inc GFR)
Constriction of the Afferent arteriole
increased plasma protein content
Urethral obstruction with a stone
Vasodilator in all except in Renal
Adenosine
What are the causes of decreased Kf (filtration coefficient of GC)?
Renal disease
DM
HPN
What are the causes of decreased GC Hydrostatic Pressure?
Hypotension (decreased arterial pressure)
Ace-I (decreased efferent arteriole constriction)
Sympathetic Activity (increased Afferent arteriole constriction)
What are the hormones that will increase GFR?
EDRF PGE2 PGI2 Bradykinin Glucocorticoids ANP BNP
What hormone preserve GFR?
Angiotensin II (preferentially constricts efferent arteriole)
What do you call massive sympathetic stimulation that results in massive vasoconstriction of the kidneys?
CNS ischemic response
Percentage of solute reabsorbed is held constant
Buffers effects of drastic GFR changes on urine output
Glomerulotubular Balance