XIII - Renal/Urinary System Flashcards
Epithelium of renal tubules
simple cuboidal
Renal Functional Unit
Nephron
Nephron Components
renal corpuscle, proximal convoluted tubule, loop of Henle, distal convoluted tubule, collecting duct
Tuft of finely fenestrated capillaries interposed between afferent and efferent arterioles
glomerulus
Bowman’s Capsule: simple squamous, continuous with PCT
outer parietal layer
Bowman’s Capsule: receives the fluid filtrates through the capillary wall and visceral layer
capsular (urinary) space
Bowman’s Capsule: podocytes resting on lamina, part of the glomerular filtration barrier
internal / visceral layer
PCT: Cells
simple cuboidal with brush border
PCT: Location
cortex
Thin Limbs of Loop of Henle: Cells
simple squamous
Thin Limbs of Loop of Henle: Location
medulla
Thick Ascending Limb of Loop of Henle: Cells
simple cuboidal
Thick Ascending Limb of Loop of Henle: Location
medulla, medullary rays
DCT: Cells
simple cuboidal
DCT: Location
cortex
Collecting Duct - Principal Cells: Features
most abundant, cuboidal to columnar
Collecting Duct - Principal Cells: Location
medulla and medullary rays
Collecting Duct - Intercalated Cells: Features
few, scattered
Collecting Duct - Intercalated Cells: Location
medullary rays
Principal cells absorb
sodium
Principal cells secrete
potassium
Intercallated cells absorb
bicarbonate, potassium
Intercallated cells secrete
hydrogen
Glomerular Filtration Barrier
capillary endothelium, basement membrane, podocyte foot processes
Glomerular Filtration Barrier: Size
capillary endothelium
Glomerular Filtration Barrier: Charge
basement membrane, podocyte foot processes
Modified smooth muscle cells that secrete renin, afferent arteriole
JG (juxtaglomerular) cells
Monitors the concentration of sodium in the distal tubules
macula densa
Contains receptors for angiotensin II and atrial natriuretic peptide
mesangial cells
Mechanism involving kidneys responsible for regulation of blood pressure
renin-angiotensin-aldosterone system (RAAS)
Male Urethra: 3-4 cm, urothelium
prostatic
Male Urethra: short, passes through external sphincter, stratified columnar, pseudostratified columnar
membranous
Male Urethra: 15cm, stratified columnar, psudostratified columnar, stratified squamous (distal)
spongy
Female Urethra: Length
4-5 cm
Female Urethra: Epithelium
transitional, stratified squamous (distal), some areas of pseudostratified columnar