Week 11 - Urinary System Flashcards
4 organs of the urinary system
Kidneys
ureters
urinary bladder
urethra
Functions of the urinary system
Excretion
Elimination
Homeostatic regulation
Through what blood vessel does the kidneys receive blood
Renal artery
2 sympathetic innervations
- Adjusts rate of urine formation
- Influences urine composition
Define nephrons
Microscopic functional units of kidneys
three metabolic wastes
urea
creatine
Uric acid
kidneys function
concentration filtrate
Reabsorption and retention of valuable materials
Basic process of urine formation
Filtration
Reabsorption
Secretion
2 factors that govern glomerular filtration
Hydrostatic pressure
Colloid osmotic pressure
Define glomerular hydrostatic pressure (GHP)
Blood pressure in glomerular capillaries
Function of Capsular hydrostatic pressure (CsHP)
- Opposes glomerular hydrostatic pressure
- Pushes water and solutes out of filtrate
Define net hydrostatic pressure
- Difference between glomerular hydrostatic pressure and capsular hydrostatic pressure
GHP - CsHP = NHP
Define colloid osmotic pressure
Pressure due to materials in solution
Glomerular filtration rate
125 mL/min
3 methods of GFR regulation
- Autoregulation (local level)
- Hormonal regulation (initiated by kidneys)
- Autonomic regulation (by sympathetic division of ANS)