Urinary System

Question 1

Kidney

Answer 1

• Cortex - protect kidney, house nephrons where filtration occurs
• Medulla - reabsorption occurs here in the renal pyramids
• Calyces - minor/minor calyces, renal pelvis where secretion occurs

Question 2

Nephron Classification

Answer 2

Juxtamedullary nephron = reabsorption
Cortical nephrons = filtration

Question 3

Renal Corpuscle

Answer 3

Filtering station
- Glomerulus = where the filtration occurs
- Bowman’s capsule = captures and hold the filtration
○ Parietal = protect
○ Visceral = pass through of filtration
○ In-between where filtration is stored
- Juxtaglomerular apparatus: controls the amount of filtration that occurs

Question 4

Nephron Function

Answer 4

• Proximal Tubule
  ○ Reabsorption, Where 65% of all the material we filter is reabsorb
  
  • Descending loop of Henle
    ○ reabsorption
  • Ascending loop of Henle
    ○ no reabsorption, Secretion
  • Distal tubule + Collecting duct
    ○ small amount of water is reabsorbed, but mostly Secretion

Question 5

Arteries of Kidney

Answer 5

• Renal: enter kidney
• Afferent arterioles
• Efferent arterioles
  ○ Makes a high pressure system
• Vasa recta + peritubular capillaries: reabsorption ends up here

Question 6

Ureters

Answer 6

• brings urine from renal pelvis to urinary bladder
• Transitional epithelium

Question 7

Bladder

Answer 7

• stores urine
• Trigone: detrusor muscle moves towards it (pulls bladder down)

Question 8

Urethra

Answer 8

• bladder - excretion
• Internal sphincter = automatic, smooth muscle, and response to pressure
• External sphincter = somatic, skeletal muscle