Biopsychology : Nervous System

Question 1

The function of the motor neuron and how does it look like?

Answer 1

It carries the messages from the CNS to effectors such as muscles and gland
SHORT dendrites and LONG axons

Question 2

Function of relay neuron and the length of the fibres

Answer 2

Transfers messages from sensory neutrons to motor neuron
SHORT dendrites and SHORT/LONG axons

Question 3

Function and structure of sensory neuron

Answer 3

Carries message from the PNS to the brain and spinal cord
LONG dendrites and SHORT axons

Question 4

What are terminal buttons and how do they help?

Answer 4

They are at the end of the axons so they can communicate and pass electrical impulses via each neuron

Question 5

Electric transmission

Answer 5

When a neuron is in RESTING state, it is NEGATIVELY charged.
When it is ACTIVATED by a STIMULUS, it becomes CHARGED for a split charged causing an ACTION POTENTIAL to occur
Which creates an ELECTRIC IMPULSE that travels down the axon towards the end of the neuron

Question 6

Synaptic transmission

Answer 6

The process by which neighbouring neurons communicate with each other by sending chemical messages across the synapse that separates them

Question 7

Summation and the two possible outcomes

Answer 7

It is whether the postsynaptic motor neurons fire or not

1.IF the neurotransmitters is excitatory and the NET charge is POSITIVE, the action potential occurs which causes the electrical impulse to travel down and the reaction is more likely.

2. IF the neurotransmitters is inhibitory and the NET charge is negative, then the neuron is less likely to fire and does not cause a reaction

They both are summed which decides on the net effect and therefore the reaction