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Introduction to the science of sport, exercise and health > Fluid absorption > Flashcards

Fluid absorption Flashcards

1
Q

Group of membrane proteins most cell membranes have

A

Aquaporins

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2
Q

Osmosis

A

The diffusion of water from a region of high water concentration to a region of low water concentration

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3
Q

What does osmolarity describe

A

The number of particles in a solution, says nothing about the nature of the particles

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4
Q

osmotic flux

A

changes the volume of the cell

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5
Q

what causes an osmotic flux

A

Change in the concentration of a solute that cant cross the membrane

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6
Q

What does the volume of the cell depend on

A

The concentration of the non-penetrating solutes on the two sides of the membrane

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7
Q

ECF non-penetrating solutes

A

Na+ Cl-

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8
Q

ICF non-penetrating solutes

A

K+ (and organic anions)

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9
Q

Cell membrane

A

Selective barrier

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10
Q

Selective barrier

A

permeable to some substances but not all

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11
Q

what substance is there no barrier to

A

water

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12
Q

which 2 things follow their own concentration gradient

A

-partles

water

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13
Q

What cant follow its own gradient

A

Solutes

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14
Q

osmotic pressure

A

The pressure that must be applied to a solution containing non-penetrable solutes to prevent the net flow of water into the solution

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15
Q

The lower the water concentration

A

the higher the osmotic pressure

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16
Q

the greater the osmolarity

A

the greater the osmotic pressure

17
Q

Rough ECF osmolarity

18
Q

osmolarity - whats it measured in

A

milliosmoles

19
Q

Tonicity of the solution

A

Number of non-penetrating solute particles

20
Q

Isotonic solution

A

Solution of 300mOsm of non-penetrating solutes (wont cause a cell placed in to swell or shrink)

21
Q

Hypotonic solution

A

Solution less than 300mOsm of non-penetrating solutes (will cause cells to swell)

22
Q

Hypertonic solution

A

Solution more than 300mOsm of non-penetrating solutes (will cause cells to shrink)

23
Q

What happens to cells suspended in urea

A

They will burst

24
Q

Why do cells burst when suspended in urea

A
  • Urea can move across membrane

- Not an effective osmole

25
Q

What type of saline is best

Introduction to the science of sport, exercise and health (24 decks)

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