water homeostasis Flashcards

1
Q

what are areas separated by selectively permeable membranes that differ in composition

A

fluid compartments

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2
Q

what is the body fluid in-between the circulatory system and cells

A

interstitial fluid

tissue fluid

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3
Q

where is transcellular fluid

A

in epithelial lined cavities

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4
Q

chloride homeostasis is achieved as a side effect of ___ homeostasis

as ___ is retained or excreted, Cl will _____

A

Na

Na, follow (passively)

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5
Q

in what tissues is chloride homeostasis in

A

blood plasma

tissue

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6
Q

how is phosphorus generated in intracellular fluid

(2)

A

ATP hydrolysis

other phosphate compounds

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7
Q

how are most electrolytes obtained

what organ is the most important in regulating them

what metric is electrolyte concentration expressed in

A

ingested foods and fluids

kidneys

mEq/L

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8
Q

what is needed for osmosis

A

osmotic gradient

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9
Q

osmotic gradient is determined by relative ____ in each compartment

what are the most abundant solute particles

A

solutes

electrolytes

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10
Q

what is the most significant electrolyte needed for osmosis

it is the main contributor to ____ osmolity and ECF _____

A

Na

serum

tonicity

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11
Q

what is pulmonary and cerebral edema contributed to

what can this cause

A

fluid excess

death

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12
Q

fluid excess:

what does renal failure lead to
what hormone increase can this be attributed to

in this case, both Na and water are retained, and ECF remains _____

A

effective kidneys

volume excess
aldosterone

isotonic

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13
Q

fluid excess:

what is another term for hypotonic hydration

how does this happen

water __ Na retention or ingestion

what hormone hyper secretion can this be attributed to

A

water intoxication

if you lose water and salt and replace it with plain drinking water

greater than

ADH
water retention while still losing salt

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14
Q

circulatory shock and neurological dysfunction can be attributed to

A

fluid deficiency

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15
Q

what is cirulatory shock from

what is neurological dysfunction from

A

loss of blood volume

dehydration of neurons

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16
Q

in volume depletion~

how are water and Na lost relatively

how is total body water affected
how is osmolarity affected

what hormone can this be caused from
what disease can cause this

A

proportionate

less
no affect

decreased aldosterone
Addisons

17
Q

does fluid deficiency cause hyper or hypo tension

A

hypotension

18
Q

what happens in dehydration (negative water balance):

the body eliminates more ___ than ___

does ECF osmolarity increase or decrease

what hormone can cause this
what disease can cause this
the overuse of what can cause this

A

eliminates more water than sodium

increase

lack of ADH
diabetes
diuretics

19
Q

where is the thirst center in the brain
what are the receptors for this

A

hypothalamus
osmoreceptors

20
Q

recap~

increased osmolarity &
decreased arterial pressure:

what is secreted

is ADH released or inhibited

what does this cause the kidneys to do
why

is water excretion increased or decreased

A

angiotensin II

released

absorb more water
so water can be put back into blood cells

decreased

21
Q

recap~

decreased osmolarity:

what is secreted

is ADH released or inhibited

what does this cause the kidneys to do
why

is water excretion increased or decreased

A

nothing

inhibited

reabsorb water less
so it won’t go back into the blood and can just be peed out

increased

22
Q

what is the only way to control water output

A

variations in urine volume

23
Q

what 2 things allow for adjustments in sodium reabsorption

why is this important for water

A

natriuretic peptides
aldosterone

water accompanies na

24
Q

what detect changes in blood osmolarity

what detect changes in blood pressure

A

osmoreceptors

baroreceptors

25
Q

when ADH is secreted,

what is kept
what is secreted

how does this change osmolarity

A

water
Na

increases it

26
Q

when ADH is secreted, what increases in collecting ducts

what does this do

A

auquaporins

reabsorb water and excrete sodium

27
Q

in the absence of ADH, what are impermeable to water (2)

what does this mean

A

ditstal tubule

collecting duct

less water is absorbed by kidneys and is excreted as urine

28
Q

what secreted ADH

A

hypothalamus

29
Q

in response to dehydration,

what is secreted

what does this do to plasma osmolarity

what does this do to plasma volume

does BP increase or decrease

A

ADH

decreases

increases

increases

30
Q

in over hydration,

what happens to blood osmolarity
what happens to ADH secretion
what happens to aquaporins
what happens to water reabsorption
is salt removed from urine

A

decreases
decreases
decreases
decreases
salt is removed

31
Q
A