Nervous System 2

Question 1

What are Nerve impulses

Answer 1

Electrochemical changes (action potential) that travels along nerve fibres along the membrane of a cell; the message carried by a nerve

Question 2

Electrochemical changes

Answer 2

Change in electrical voltage brough about by the change inconcentration of ions inside and outside of the cell membrane

Question 3

Potential difference/membrane potential

Answer 3

Difference in charge between two places
In the case of cells intracellular (environment inside the cell) and extracellular (environment outside the cell) contains charged ions that can move across the membrane with the help of membrane proteins

Question 4

Common ions found inside/outside cells

Answer 4

Sodium(Na+)
Potassium (K+)
Chloride (Cl-)

Question 5

Resting membrane potential inside cell

Answer 5

High (K+)
High (Proteins)-negatively charged
Low (Cl-)
Low (Na+)

Question 6

Resting membrane potential outside cell

Answer 6

High (Na+)
High (Cl-)
Low (K+)

Question 7

When does restingmembrane potential occur?

Answer 7

When the neuron is unstimulated

RMP is -70mV meaning that inside is 70mV less than the outside of the cell

Question 8

How do ions cross the plasma membrane

Answer 8

Protein channels some which are leakage channels (open all the time)

Voltage gated channels only open when a nerve is stimulated

Question 9

Make slide 8 flashcard

Question 10

RMP

Answer 10

The memrbrane potential of an unistimulated nerve cell (-70mV=polarised)

Question 11

Action Potential

Answer 11

The rapid depolarisation and repolarisation of the entire length of the axon

Question 12

Depolarisation

Answer 12

The process of increasing the membrane potential

Question 13

Repolarisation

Answer 13

The process of decreasing the membrane potential back to RMP (polarised state)