BMS02-1008 Ion Movement

Question 1

Functions of the CSM (4)

Answer 1

Selective barrier
Capacitance
Fluid e.g. cell division
Self sealing e.g. endo/exocytosis

Question 2

Which is the more fluid region of the phospholipid?

Answer 2

Tail

Question 3

What does cholesterol do?

Answer 3

Hold things together

Question 4

What is the most stable arrangement of a phospholipid?

Answer 4

Micelle (membrane thing one in one out)

Question 5

What is budding?

Answer 5

Leaving the cell and taking some of the membrane with you

Question 6

What can pass the CSM?

Answer 6

Hydrophobic
Alcohol
Small uncharged

Question 7

Evidence for the Na K pump

Answer 7

Tracer studies

Metabolic poisons that block the pump

Question 8

What is the pump vital for?

Answer 8

Controlling cell volume

Question 9

Symport VS antiport active transport

Answer 9

Symport 2 things same direction

Antiport 2 things different direction

Question 10

What is facilitated diffusion?

Answer 10

Passive using a protein carrier

Question 11

Na in and out

Answer 11

10 and 140

Question 12

K in and out

Answer 12

140 4

Question 13

Cl in and out

Answer 13

4 140

Question 14

When will volume of a cell remain the same?

Answer 14

When osmotic potential is the same as there are the same number of things inside as there is outside

Question 15

When will water flow in?

Answer 15

To dilute cell content so it has the same concentration as the outside, evening osmotic pressure

Question 16

What is different about urea?

Answer 16

Urea freely diffuses in down its concentration gradient, this means there lots of particles inside so the water tries to dilute it and bursts the cell

Question 17

How do we combat this?

Answer 17

NaCl has the same osmolality as urea so as long as it has the same concentration as the inside urea water wont flow anywhere

Question 18

What must you remember about the concentration inside the cell and what causes it?

Answer 18

The proteins cant leave the cell