Urinary System
System that
- Filters 150 liters Blood everyday
- Regulates Blood pressure, ph, Volume
Kidney
Located between T12 and L3 vertebrae
Protected by Ribs 11 and 12 - Floating
Fist Size
Renal Hilum
Entry and Exit for
- Renal Artery
- Renal Vein
- Ureter
- Renal Nerves
- Lymphatics
Cross- Section of Kidney
Renal Cortex
Renal Medulla
Minor and Major Calyx
Renal Pyramids
Ureter
Renal Pelvis
Renal Papillae
Renal Column separating Renal Pyramids
Renal Artery
Receives blood from Left Ventricle of Heart
Divide into Segmental Artery
-> Interlobar Artery (between Renal column
-> Arcuate Artery (base of Pyramids)
-> Cortical Radiate Artery (supplies the Cortex)
Afferent Arterioles
Glomerulus Capillaries
Efferent Arterioles
Cortical Radiate Veins
-> Arcuate Veins
-> Interlobar Vein
Renal Vein
Millions of Nephrons
Ureter
Blood Filtration - Blood pressure forces water and other solutes to move into BC
Urinary Bladder
Trigone Junction - Sensitive to expansion -> after a point sends signal to Brain -> Time to Pee
Urethra
coordination with Nervous system
When the bladder is half full, Pressure on the wall increases, Sends signals to Micturition center in spinal cord
Sends Micturition Reflex which causes contraction of bladder and relaxation of spinchter
Pontine Storage center - controls urination stops Micturition reflex
Pontine Micturation center active - Sends the Micturation reflex and ready to pee
R Kidney lower than the L kidney
Reabsorption - Reabsorbs nutrients that is required
- PCT with Microvilli,
- Concentrates the fluid in Loop of Henle and DCT (smaller dia and lack of Microvilli)
can hold 750 ml of urine in men and slightly less in women
Rugae - Muscles that expand on filling and contracts when empty
Internal Involuntary Spinchter, closed when bladder isn;t full
External Voluntary Spinchter
Secretion -
Drains urine from bladder