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Urine Formation - Coggle Diagram
Urine Formation
Processes
Glomerular filtration
Blood plasma
Diffusion of molecules & water
Filtrate
Contains
Water
Sodium
Glucose
Potassium
Amino acids
Phosphate
Calcium
Homeostasis
Autoregulation
Vasoconstriction
Vasodilation
Renin-angiotensin system
Renal baroreceptors
Renin secreted
Antiotensin I, II
Vasoconstriction
Maintain BP
Maintain GFR
Stimulates aldosterone secretion
Stimulates sodium absoprtion
1 more item...
Stimulates ADH secretion
Retain water
Cardiac hormones
ANP
When blood volume increases
Increase sodium excretion
BNP
When BP increases
Increase sodium excretion
Tubular reabsorption
Diffusion
Colloid osmotic pressure
Osmosis
Water reabsorption
Influenced by sodium
Active transport
Renal plasma threshold
Max transport capacity
Sodium cations
Passive transport
Anions tag along
Endocytosis
Proteins
Filtrate ---> interstitial fluids
Tubular secretion
Active transport
Like reabsoprtion, reversed
Histamine
Penicillin
Potassium levels controlled
Aldosterone
Peritubular capillary plasma ---> filtrate
Pathway
Blood
Afferent arterioles
Glomerulus
Filtrate
Proximal convoluted tubule
Descending Nephron loop
Ascending Nephron loop
Distal convoluted tubule
Urine
Efferent arterioles
Peritubular capillaries
Vasa recta
Capillary loop
Water Regulation
Decreased water
ADH released
Distal convoluted tubules
Aquaporins inserted
Water permeability increased
More water in interstitial fluids
Less water in urine
Osmotic gradient
Countercurrent mechanism
Nephron loop ascending limb
Impermeable to water
Filtrate hypotonic
Permeable to solutes
Sodium & chloride ions released
Interstitial fluid hypertonic
Nephron loop descending limb
Permeable to water
Water ---> hypertonic environment
Impermeable to solute
Countercurrent multiplier
Circular increase of NaCl
Result of countercurrent mechanism