Nervous System

Question 1

What is a nerve impulse

Answer 1

An electrical signals that passes along nerve cells

Question 2

Central nervous system consists

Answer 2

Brain + spinal cord

Question 3

Peripheral central system consists

Answer 3

All the nerves in the body

Question 4

Sensory neurons

Answer 4

Sense organs to CNS

Question 5

Relay neurons

Answer 5

CNS to connect sensory and motor neurons

Question 6

Motor neuron es

Answer 6

CNS to effector

Question 7

Reflex arc

Answer 7

Stimulus -> sensory neurons -> relay neurons in CNS -> motor neuron-> effector -> response

Question 8

What is a synapse

Answer 8

Junction that neuron forms with another cell for communication

Question 9

How is the impulse transmitted between two neurons

Answer 9

1) an impulse arrives at the end of the presynaptic neurons
2) vesicles move towards, and fuse with the presynaptic membrane.this release neurotransmitters into the synaptic cleft
3) the neurotransmitter diffuse across the synaptic cleft (down a concentration gradient)
4) neurotransmitter attach to the receptors in the post synaptic membrane
5) this triggers an impulse which travels along the postsynaptic neurons
6) neurotransmitter are recycled or destroyed once an impulse is sent

Question 10

What is the purpose of the synapse

Answer 10

To ensure that impulse travel in one direction

Question 11

Give 3 examples of drugs that affect the synapse

Answer 11

Alcohol
Heroin
Nicotine