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A student suddenly touches a sharp thorn and pulls the hand away without thinking. Which sequence shows the correct pathway?
Receptor → Sensory neuron → Relay neuron → Motor neuron → Effector
If a person has difficulty maintaining balance after an accident, which part of the brain is most likely damaged?
Cerebellum
The structural and functional unit of the nervous system is:
Neuron
A patient has an injury in the medulla oblongata. Which condition may occur?
Losing control of heartbeat and breathing
A student suddenly hears a loud explosion outside the classroom. His heart rate increases and he feels scared. Which part of the nervous system is mainly responsible for this reaction?
Medulla oblongata
While doing an experiment on reflexes, a doctor cuts the motor neuron supplying a muscle. What will happen if the sensory neuron is still intact?
The muscle will not contract because messages cannot reach it.
A man eats food, and his salivary glands immediately start producing saliva. Here, the effector is:
Tongue
Which of the following BEST describes the role of the nervous system?
It acts as a communication system between body and environment.
Name the part of the neuron that receives messages.
Dendrite
Which part of the neuron carries impulses away from the cell body?
Axon
Define reflex action in one line.
Quick, automatic, involuntary response to a stimulus
The pathway of a reflex action is called?
Reflex arc
How many pairs of spinal nerves are there in humans?
31 pairs
Gaps between myelin sheath are known as:
Nodes of Ranvier
Which part of the brain controls voluntary actions?
Cerebrum
Which nerve carries messages from sense organs to the brain/spinal cord?
Sensory neuron
