membrane transport, tonicity and osmolarity

Question 1

what is an iontropic receptor?

Answer 1

receptor activation casues conformmation change in it so ion can pass through
- voltage gated channels or ligand gated
> fast acting and have multiple subunits

Question 2

a GCPR is an example of?
A iontropic receptor
B intracellular receptor
C metabotrophic receptor
D ligand-gated receptors
E voltage-gated receptors

Answer 2

OPTION C
ligand binding intiates the intracellular signalling! can amplify or inhibit signal
- glutamate receptors + adrenergic receptors of the ANS
> slower acting and monomers

Question 3

do symporters transport across membrane
A one substanace
B more than one substance in different direction
C more than one substance in the same direction

Answer 3

OPTION C!
e.g NKCC2 in kindey that can dilute/conc urine
> co-transport basically

Question 4

TRUE OR FALSE?

ActiveTransport always use ATP

Answer 4

FALSE

secondary AT uses electrochemical gradient to move other substances agaisnt their electrochemical gradient

Question 5

when would regualatory volume decrease (RVD) occur?

water balance disorder

Answer 5

if cell is hypotonic, water will move in and cellswells so to regulate this is will do RVD
channels will open to move ions out

Question 6

why do we need aquaporins in our cell membrane?

Answer 6

cell membranes are hydrophobic :0 so impermeable to water

aquaporins can regualte the water flux

Question 7

if table salt (NaCl) has molarity of 1 mol/L, what is its osmolarity?

Answer 7

2 mol/L as the salt will separate out into Na+ and Cl-

Question 8

which of these describes the number of particles in a solution?
A molarity
B osmolarity
C moles
D osmolality

Answer 8

OPTION B

osmolarity!

Question 9

how is osmoaLity different from osmolarity?

Answer 9

uses weight instead of volume, useful in medicine study

unit Osm/kg not Osm/L