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Physiology Exam IV > Regulation of Body Fluids > Flashcards

Regulation of Body Fluids Flashcards

1
Q

how much total body water does the ICF contain

A

2/3

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2
Q

how much total body water does the ECF contain

A

1.3

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3
Q

What are the subdivisions of the ECG

A

interstitial fluid
plasma volume
transcellular fluids

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4
Q

How much of the ECF is interstitial fluid

A

~75%

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5
Q

How much of the ECF is plasma volume

A

~25%

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6
Q

most important cation of ICF

A

K+

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7
Q

most important anions of ICF

A

phosphates, protein

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8
Q

most important cation of ECF

A

Na+

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9
Q

most important anion of ECF

A

Cl-

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10
Q

What happens if you ingest pure water

A

ECF becomes diluted and hyptonic

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11
Q

what happens if you add isotonic saline

A

ECF increases in size, osmolality stays the same

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12
Q

What happens if you add hypertonic salin

A

ECF osmolatity increases, volume of ECF comparment increases, volume of ICF compartment decreases

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13
Q

ineffective osmole

A

won’t cause fluid shifts because they can diffuse easily in and out of the membrane

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14
Q

why does elevated plasma urea conc not elict ADH release

A

because ADH release is triggered by an increase in osmolatity and urea does not cause an increase in osmolaity because it is an ineffective osmole

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15
Q

what causes thirst

A

shrinkage of thirst osmoreceptors in response to increased osmolaity of ECF. also a decrease in blood volume which is detected by barorecptors

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16
Q

how does angiotensin II affect thirst

A

increases thirst

17
Q

what happens to bp if you give salt to a salt sensitive individual

A

increases

18
Q

how does bp affect renal sympathetic nerves

A

increased bp causes decreased activity of renal sympathetic nerves

19
Q

how does renal symphatetic nerves affect renin

A

decreases in renal sympathetic nerves causes decrease in renin secretion

20
Q

how does renin secetion affect proximal tubule Na+ reabsorption

A

decrease in renin secretion causes decrease in prozimal tubule Na+ reabsorption

21
Q

What takes place if you have a hemorrahges

A

decrease bp
increase activity of renal sympahteic nerves and renin secertion
increase plasma and renal renin, plasma and renal angiotesin ii
causes construction of renal arteriols
decreass RBF and GFR
decreas tubular sodium and water reaborption
decreass renal excretion of sodium and water

22
Q

what are ADHs actions on the kidney

A

binds to basopressure type 2 receptors on colelcted sucks,
casoconstricts pericytes
increass permeability of medullary collecting ducts to urea

23
Q

what happens when you vasoconstrict pericytes

A

decreass blood flow through the vasa recta

24
Q

how does ADH increase permeability of medullary collecting ducts to urea

A

by increasing the number of urea uniporters

Physiology Exam IV (16 decks)

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