Physiology 1 (body fluid compartments)

Question 1

what is osmolarity

Answer 1

concentration of osmotically active particles present in a solution

Question 2

what are the units of osmolarity

Answer 2

osmol/l or mosmol/l

Question 3

when is mosmol/l used

Answer 3

body fluids as these are weak salt solutions

Question 4

osmolarity can be calculated if what two factors are known

Answer 4

1. molar concentration of the solution

2. number of osmotically active particles present

Question 5

what is osmolality measured in

Answer 5

osmol/kg water

Question 6

when are osmolarity and osmolality interchangeable

Answer 6

weak salt solutions (body fluids)

Question 7

what is tonicity

Answer 7

the effect a solution has on cell volume

Question 8

what are the 3 types of tonicity a solution can be

Answer 8

hypo, hyper or iso

Question 9

what effect do isotonic solutions have on the cell

Answer 9

no change

Question 10

what effect do hypotonic solutions have on the cell

Answer 10

increase

Question 11

what effect do hypertonic solutions have on the cell

Answer 11

decrease

Question 12

although related to osmolarity what else does tonicity take into account

Answer 12

the ability of a solute to cross the cell membrane (permeability)

Question 13

what percentage of a males body is water

Answer 13

60%

Question 14

what percentage of a females body weight is water

Answer 14

50%

Question 15

what is the reason for females having less body water than males

Answer 15

different %age of fat distribution

fat contains little water