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Physiology SF > L4 - Body Fluids > Flashcards

L4 - Body Fluids Flashcards

1
Q

why are body fluids important

A
  • primary transport system between cells
  • large part of internal environment
  • fluid composition critical for cell function
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2
Q

how much does 1L of water weigh in kg

A

1kg

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3
Q

how many litres total body water (TBW) for average 70kg male

A

42L - 60% of body mass

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4
Q

what is boundary of interstitial fluid / intracellular fluid

A

cell membrane

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5
Q

what is permeability of interstitial fluid / intracellular fluid

A

selectively permeable - ion pumps

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6
Q

what is boundary of interstitial fluid/ plasma

A

capillary wall

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7
Q

what is permeability of interstitial fluid/plasma

A

permeable to small molecules

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8
Q

what is osmosis

A

when water moves from a lower to higher solute concentration

the movement is passive

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9
Q

what is tonicity

A

the effect of solute concentration on cell volume

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10
Q

what is a hypotonic solution

A

cell gains water - swells

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11
Q

what is a hypertonic solution

A

cell loses water - shrinks

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12
Q

what does the lymphatic system do

A

returns lymph to the cardiovascular system

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13
Q

where does lymph re-enter

A

it re-enters circulation near the right atrium

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14
Q

what happens when outward pressure is greater than inward pressure

A

fluid leaves the capillary and enters interstitial fluid

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15
Q

what is colloid OP

A

osmotic pressure of plasma proteins

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16
Q

what occurs during liver failure in capillaries

A
  • fall in plasma proteins
  • colloid OP falls
  • reduced inward flow
  • Oedema
17
Q

where is plasma regulated

A

kidney

18
Q

what is interstitial fluid

A

the environment for all cells

19
Q

what are regulated for water balance

A

fluid intake and urine output

20
Q

what is total body water composed of

A

intracellular fluid and extracellular fluid

21
Q

what is extracellular fluid composed of

A

plasma and interstitial fluid

22
Q

what does the presence of plasma proteins do

A

exert an inward osmotic force

Physiology SF (5 decks)

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