Lecture 3

Question 1

Electrical activity of neurons

Answer 1

Decides when to transmit a message to the next neuron

Question 2

Ions

Answer 2

Electrically charged atoms

Question 3

The more impactful the event, the more..

Answer 3

neurons fire

Question 4

“All or nothing”

Answer 4

All action potentials are the same size

Question 5

Action Potential

Answer 5

Rapid shift in the electrical charge of a neuron, that stimulates it to communicate with another neuron via neurotransmitters

Question 6

5 stages of action potential

Answer 6

1) Inactive 2) NT are sent and bind with RS. Cell membranes open. +ve ions enter. 3) Stimulus Threshold is reached and neuron preps to fire. +ve ions continue to enter 4) Neuron fires! Electrical charge shoots down axon causing axon terminals to release NT to next neuron 5) Activity ceases. “Refractory period”. Returns to resting potential

Question 7

Neuron electrical charge at 5 stages of action potential

Answer 7

1) Resting potential -70 volts 2) less negative 3) reaches stimulus threshold -60v 4) Peak positivity +30v 5) Dips down to -90v before returning to -70v

Question 8

Answer 8

Question 9

Answer 9

Question 10

Answer 10