Structure and Function off the NS

Question 1

Name 6 structures of an axon?

Answer 1

• Dendrites
• Soma / Cell body
• Nucleus
• Axon
• Terminal buttons
• Myelin

Question 2

Ion channels are

Answer 2

membrane proteins

Question 3

(Blank) is impermeable to ions

Answer 3

Membrane

Question 4

What allows ions through?

Answer 4

ion channels or ionophores

Question 5

Resting potential of ion channels?

Answer 5

-70 mV

Question 6

What determines the resting potential?

Answer 6

permeability

Question 7

Ion channel structure?

Answer 7

channel proteins , lipid bilayer

Question 8

Two types ion ion channels?

Answer 8

Gated and non gated

Question 9

What are the two subdivisions of Gated channels?

Answer 9

Ligand and voltage gated

Question 10

The flow of ions is?

Answer 10

Against concentration gradient

Question 11

Where does the resting potential come from?

Answer 11

membrane has a negatively charged inner lining of relatively large proteins with a negative charge called A- ions (anions)

Question 12

Name 4 elemental ions?

Answer 12

• K+ (potassium)
• Na+ (sodium)
• Cl- (chloride)
• CA+ + (calcium)

Question 13

What causes uneven distribution of ions?

Answer 13

• Na+ /K+ ion pump
  – Concentration gradient (diffusion)
  – Electrostatic gradient

Question 14

How does the \ Na+ /K+ ion pump cause uneven distribution

Answer 14

• 2 K+ pumped in for every 3 Na+ pumped out

- more + ions outside than inside

Question 15

What causes stimulation of the Action Potential?

Answer 15

Local potential

• depolarization
• hyperpolarization