Forces acting across membranes 1-3

Question 1

Glycoprotein

Answer 1

Carbohydrate and protein

Question 2

Glycolipid

Answer 2

Carbohydrate and lipid

Question 3

Na+ is high in

Answer 3

ECF but also a little bit of K+

Question 4

Why is there more K+ in ECF than Na+ in ICF?

Answer 4

Easier for potassium to get out of cells due to leaky membrane

Question 5

Peripheral proteins

Answer 5

Maintain structure, anchor to matrix and signal functions

Question 6

Less protein = good or bad insulator?

Answer 6

Good eg myelin sheath

Question 7

High protein = high/low activity?

Answer 7

High eg mitochondria 75%

Question 8

Electrical gradient

Answer 8

Difference in charge of ions across the membrane

Question 9

Electrogenic pump

Answer 9

Creates charge difference across the membrane with a net movement of positive out of cell

Question 10

What 3 features do the lipid bilayer favour?

Answer 10

Small, uncharged and lipophilic

Question 11

Carrier mediated

Answer 11

If opposes movement require an ATPase

Question 12

H20 conc proportional to?

Answer 12

1/ solute conc

Question 13

Osmotic pressure

Answer 13

Pressure applied to oppose osmosis

Question 14

Osmolarity

Answer 14

Total number of solute particles

mOSMOL/L

Question 15

Normal human plasma osmolarity

Answer 15

300 (285) mOSMOL/L

Question 16

Osmotic flux

Answer 16

If particle cannot cross the membrane water will move to compensate

Question 17

Non penetrating particle in ICF

Answer 17

potassium

Question 18

Non penetrating particles in ECF

Answer 18

Sodium and chlorine

Question 19

Tonicity

Answer 19

Number of non penetrating particles in solution

Question 20

Cells in hypotonic solutions

Answer 20

Swell

Question 21

Cells in hypertonic solutions

Answer 21

Shrink