Urinary System

System that

  1. Filters 150 liters Blood everyday
  2. Regulates Blood pressure, ph, Volume

Kidney image

Located between T12 and L3 vertebrae

Protected by Ribs 11 and 12 - Floating

Fist Size

Renal Hilum

Entry and Exit for

  1. Renal Artery
  2. Renal Vein
  3. Ureter
  4. Renal Nerves
  5. 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

image

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 image

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