Fluid absorption

Question 1

Group of membrane proteins most cell membranes have

Answer 1

Aquaporins

Question 2

Osmosis

Answer 2

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

Question 3

What does osmolarity describe

Answer 3

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

Question 4

osmotic flux

Answer 4

changes the volume of the cell

Question 5

what causes an osmotic flux

Answer 5

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

Question 6

What does the volume of the cell depend on

Answer 6

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

Question 7

ECF non-penetrating solutes

Answer 7

Na+ Cl-

Question 8

ICF non-penetrating solutes

Answer 8

K+ (and organic anions)

Question 9

Cell membrane

Answer 9

Selective barrier

Question 10

Selective barrier

Answer 10

permeable to some substances but not all

Question 11

what substance is there no barrier to

Answer 11

water

Question 12

which 2 things follow their own concentration gradient

Answer 12

-partles

water

Question 13

What cant follow its own gradient

Answer 13

Solutes

Question 14

osmotic pressure

Answer 14

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

Question 15

The lower the water concentration

Answer 15

the higher the osmotic pressure

Question 16

the greater the osmolarity

Answer 16

the greater the osmotic pressure

Question 17

Rough ECF osmolarity

Answer 17

300mOsm

Question 18

osmolarity - whats it measured in

Answer 18

milliosmoles

Question 19

Tonicity of the solution

Answer 19

Number of non-penetrating solute particles

Question 20

Isotonic solution

Answer 20

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

Question 21

Hypotonic solution

Answer 21

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

Question 22

Hypertonic solution

Answer 22

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

Question 23

What happens to cells suspended in urea

Answer 23

They will burst

Question 24

Why do cells burst when suspended in urea

Answer 24

• Urea can move across membrane

- Not an effective osmole

Question 25

What type of saline is best

Answer 25

Isotonic