Name the type of neuron shown in the diagram. Give two reasons for your answer. (3)
Type of neuron: Motor neuron
Short dendrites and a long axon.
Short dendrites attached to cell body.
Cell body near the start of the neuron.
(Any 2)
In which direction would a nerve impulse travel, L to R or R to L? (2)
Left to Right
State the function of the synaptic vesicle. (1)
The synaptic vesicle stores neuro-transmitters.
Name type of neurons shown in the diagram above. (2)
Sensory neuron (left)
Motor neuron/interneuron (right)
Briefly explain why the synaptic gap is always very narrow. (2)
It allows the neuro-transmitters to diffuse easily from one neuron to the next. (The smaller the gap the quicker the transmission.)
Name the neuron that is damaged when a person is able to feel pain, but cannot react to the stimulus. (1)
motor neuron
Name the effector. (1)
muscle
Name the part of the neuron that transmits impulses to the cell body. (1)
dendrite
Name the region where the impulse is transmitted chemically. (1)
synapse
Describe the importance of a reflex action in the human body. (2)
Allows the person to respond rapidly and without thinking/involuntarily to a stimulus to prevent damage to the body.
State ONE way in which the myelin sheath assists in the functioning of neurons. (2)
It acts as an insulator and therefore, speeds up the nerve impulse.
