neuron messengers

Question 1

membrane is HIGHLY permeable for what chemicals?

Answer 1

potassium and calcium

Question 2

membrane is SLIGHTLY permeable for what chemical?

Answer 2

sodium

Question 3

the extracellular fluid has a high concentration of what?

Answer 3

sodium and calcium ions

Question 3

the extracellular fluid has a high concentration of what?

Answer 3

sodium and calcium ions

Question 4

the intracellular fluid contains

Answer 4

potassium and negative proteins made by cells

Question 5

sodium potassium pump

Answer 5

takes sodium out of cells and potassium into cells

Question 6

polarised membrane

Answer 6

unlike charges are separated by membrane
forces pulling charges together
when they come together they release energy

Question 7

how is potential difference between 2 places measured

Answer 7

voltage(V) or (mV)
resting membrane -70mV
membrane potential is large in nerve and muscle cells
(sodium concentration is 10x higher outside cell
potassium is 30x higher on inside)