renal function and kidney disease Flashcards

1
Q

functions of urinary system

A
filters waste products
conserves nutrients
regulates ion levels
regulates blood pH
regulate blood volume
regulate erythrocyte production
store/excrete urine
secretes hormones
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2
Q

where are nephrons found

A

medullary regions

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3
Q

3 mechanisms of urine formation

A

glomerular filtration
tubular reabsorption
tubular secretion

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4
Q

what is glomerular filtration

A

filtering of blood into tubule forming primate urine

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5
Q

what is tubular resabsorption

A

absorption of substances needed by body from tubule to blood

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6
Q

what is tubular secretion

A

secretion of substance to be eliminated by the body into the tubule from blood

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7
Q

describe process of glomerular filtration

A

blood in the glomerulus within the bowman capsule

blood forced out under high pressure, protiens remain in the blood

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8
Q

what are the flitration forces

A

hydrostatic pressure of the blood entering (glomerular hydrostatic)
hydrostatic pressure within the capsule (capsular hydrostatic pressure)
blood colloid osmotic force

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9
Q

deserve the basement membrane

A

capitularies foot processes embedded in it

barrier with gaps in it

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10
Q

describe tubular resorption

A

filtrate moves to proximal tubule via passive/facilitated diffusion, primary active transport and secondary active transport

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11
Q

desrive AT in tubular resporbation

A

SGLT2 pumps sodium across the membrane- brings glucose
sodium is exchanged with potassium into blood (via AT)
glucose is transported by GLUT

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12
Q

what occurs at renal threshold

A

GLUT is saturated, no more glucose can diffuse in

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13
Q

describe tubular secretion

A

occurs in the proximal and distal tubule

maintains the acid/base balance and exchange of material

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14
Q

what hormones are used to maintain homeostasis

A

ADH

Renin-angiotensin system

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15
Q

what does RAAS do

A

stimulates sodium reabsorption in the distal tubules and collecting tubule

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16
Q

what is RAAS oppose by

A

natriuretic peptide

17
Q

what is RAAS regulated by

A

kidney

18
Q

what else can RAAS act on

A

aldosterone production in adrenal glands

19
Q

what is aldosterone stimulated by

A

ANG II
potassium
fall in sodium

20
Q

what regulates urine concentration

A

ADH/vasopressin

medullary counter current system

21
Q

describe the use of vasopressin

A

hypothalamus detects change in osmolarity
increase in blood osmolarity - thirst repsonce
secretion of ADH by pituatory
increased permeability of collecting duct

22
Q

how does ADH/vasopressin increase permeability of collecting duct

A

vesicles with aquaporins move to the membrane of the cell

23
Q

how is an osmotic gradient established in the nephron

A

loop of henle

24
Q

explain the meduallary counter current system

A

decending limb permeable to water, no AT of water
acending limb
impermable to water, AT sodium out of tubule

25
Q

types of renal failure

A

acute

chronic

26
Q

structure of the glomerulus during kidney disease

A

basement membrane becomes thickened and damaged

altered ability to filtrate and regulate

27
Q

what occurs during kidney disease

A

change to basement membrane

increased BP

28
Q

what does increase BP lead to in the kidney

A

some glucose forced out

changes in sodium reabsorption