Urinary System I & II Flashcards Preview

Histology Post Midterm > Urinary System I & II > Flashcards

Flashcards in Urinary System I & II Deck (79)
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31

why is the renal cortex granular?

renal corpuscle

32

what marks the boundary between cortex and medulla?

arcuate a.

33

what are the two parts of the cortex?

pars recta
pars convoluta

34

what makes up the pars convolute?

renal corpuscle
convoluted porteion of the distal and proximal tubules
corticocollecting duct

35

what is the parenchyma of the urinary system and where is it located?

uriniferous tubule
renal lobule

36

define renal lobule?

going from one interlobular blood vessel to the next interlobular blood vessel

37

what hemisects pars convoluta?

interlobular a.

38

what marks the beginning of the DCT?

macula densa

39

what type of capillaries do cortical nephrons have?

peritubular

40

what type of capillaries do juxtamedullary nephrons have?

vasa recta

41

where do peritubular and vaca recta capillaries come off?

efferent arterioles

42

where do podocytes sit?

in urinary space

43

what happens if intraglomerular mesangial cells do not work?

membranous nephritis

44

what happens is there is no diaphragm present across slits?

nephritis

45

what is it called when the pedicles are laying down and not doing their job (80% of kids)?

adolescence nephritis

46

what organ has the largest basement membrane?

kidney

47

what are characteristics of the descending pars recta (straight portion) of the proximal tubule?

lined by simple cuboidal epithelium
prominent brush border
cells are shorter that PCT
region is often damaged in acute renal failure and mercury poisoning
initial part of thick descending limb of the loop of Henle

48

what kind of epithelium does the thin limb of the loop of Henle have?

simple squamous - buldging nucleus into lumen!

49

what type of epithelium makes up the thick limb of the loop of Henle?

simple cuboidal epithelium
nuclei in apical position
impermeable to water

50

what are features of the DCT?

begins at macula densa
mv short
nuclei in apical portion
osmoregulator

51

what is the macula densa?

in DCT near afferent glomerular arteriole
one compartment of the juxtaglomerular apparatus

52

what are the cells like in macula densa?

tall
narrow
lined up closely
= forms a dense spot

53

where is the juxtaglomerular apparatus located?

vascular pole fo renal corpuscle

54

what makes up the juxtaglomerular apparatus?

modified smooth muscle cells of affront arteriole
efferent arteriole
macula densa
extraglomerular mesangial cells

55

what is the function of the juxtaglomerular apparatus?

JG cells release renin in response to decreased EC fluid

56

what does renin act on?

angiotensinogen in plasma - converting it to angiotensin I

57

what converts angiotensin I to angiotensin II?

capillaries in lungs

58

what does angiotensin II do?

cause a release of aldosterone from the z. glomerulosa cells in adrenal cortex

potent vasoconstrictor, elevates BP

59

what does aldosterone do?

stimulates Distal tubule cells to retain Na - water follows Na

60

what do collecting tubules in the cortex and medulla response to?

ADH = vasopressin