The Nervous System

Question 1

What is the difference between the central nervous system and the peripheral nervous system

Answer 1

The central nervous system is the brain and the spinal cord, the peripheral nervous system is every other part of the nervous system

Question 2

What is a stimulus

Answer 2

A stimulus is a change in the enviroment

Question 3

What type of neuron connects a receptor to the CNS

Answer 3

A sensory neuron

Question 4

What is an effector

Answer 4

A muscle or gland along a motor neurone that responds according to the stimulus

Question 5

What type of neuron connects the CNS to an effector

Answer 5

A motor neuron

Question 6

Describe the reflex arc

Answer 6

Stimulus detected by a receptor
Impulse passed along sensory neuron to CNS
Impulse passed along motor neurone to effector
Effector brings about the response

Question 7

How do electrical signals get transmitted

Answer 7

The electrical impulses are passed along the axon of a neurone, and are passed to other neurones which are connected by dendrites. When a nerve impulse arrives at the end of one neurone it releases neurotransmitter molecules from the synaptic vessel which then diffuse across the synaptic cleft and then bind with the receptors on the next neurons triggering another impulse carrying the impulse on. The neurones are protected by a myelin sheath which speeds up the electrical impulse.

Question 8

What is the order of the CNS response

Answer 8

Stimulus
Receptor
Sensory neurone
CNS
Motor neurone
Effector
Response