Regulation of Cell Volume

Question 1

Water movement

Answer 1

from high water concentration to low water concentration

Question 2

Ways of water movement

Answer 2

• moving through lipid bilayer
• through aquaporins (water channel)

Question 3

Molarity

Answer 3

number of molecules per litre of solution

Question 4

Osmolarity

Answer 4

number of particle in a given volume of solution

Question 5

Osmosis

Answer 5

• movement of water down concentration gradient
• water moves to dilute area of more concentrated solute

Question 6

Extra-cellular fluid (ECF)

Answer 6

high concentration of Na+ and Cl-

Question 7

Intra-cellular fluid (ICF)

Answer 7

high concentration of K+ and large polar organic solutes

Question 8

Na+ movements

Answer 8

enter cells by ion channels but pumped out by Na+/K+ ATPase pumps

Question 9

Cl- movements

Answer 9

enter cells but electrical repulsion move it out again

Question 10

K+ movements

Answer 10

move out of cells, but pumped in by Na+/K+ ATPase pumps

Question 11

Isoosmotic

Answer 11

solution containing 300mOsm solute (both penetrate and non penetrate solutes)

Question 12

Hyperosmotic

Answer 12

solution containing more than 300 mOsm of solutes (both penetrate and non penetrate solutes)

Question 13

Hypoosmotic

Answer 13

solution contain less than 300 mOsm of solutes (both penetrate and non penetrate solutes)

Question 14

Tonicity

Answer 14

describes what would happen to cell volume if were placed in solution

Question 15

Isotonic

Answer 15

• solution contain 300 mOsm non penetrate solutes
• the cells not change

Question 16

Hypertonic

Answer 16

-solution contain higher than 300mOsm non penetrate solutes
- the cell will shrink

Question 17

Hypotonic

Answer 17

• solution contain lower than 300 mOsm non penetrate solutes
• the cell will swell