Membranes

Question 1

Hyperkalemia explain

Answer 1

High plasma potassium

Question 2

Hypokalemia explain

Answer 2

low plasma potassium

Question 3

What is Ventricular fibrillation

Answer 3

medical emergancy

Question 4

What is Asystole

Answer 4

flat line

Question 5

What could be a cause of Hypokalemia

Answer 5

excessive K+ loss in urine

Question 6

What can hyperkalemia cause

Answer 6

can cause cardiac arrhythmias

Question 7

What determines cellular excitability

Answer 7

membrane potential

Question 8

What is the membrane potential largely set by

Answer 8

gradient of K+ across the cell membrane

Question 9

What closes very slowly

Answer 9

H gate (inactivation gate)

Question 10

What is an inactive ion channel

Answer 10

H gate is closed

Question 11

What opens an ion channel

Answer 11

action potential

Question 12

What phase gives the cardiac cycle its long action potential

Answer 12

Plateu phase

Question 13

The amount of negative charge to ballance the equilibrium equation is called

Answer 13

Nernst equation

Question 14

Em = (RT/zF) * ln(PK . aKo/aKi + PNa . aNao/aNai + PCl . aCli/aClo)
what equation is this

Answer 14

who gives a fuck

Question 15

What causes the membrane potential to be depolarised

Answer 15

Na

Question 16

Most cells in the heart are depolarised by

Answer 16

Na currents

Question 17

What cells are not depolarised in the heart by Na currents

Answer 17

nodal cells

Question 18

What does the refractoriness cause

Answer 18

the ventricles to refill with blood before onset of next contraction

Question 19

What are calcium channels

Answer 19

L type

Question 20

Where are T-type Ca channels located

Answer 20

pacemaker cells

Question 21

In hyperkalaemia what happens to the resting potential

Answer 21

lowers the depolarisation so we get action potentials when we don’t want them