A man eats food, and his salivary glands immediately start producing saliva. Here, the effector is:
Tongue
Name the part of the neuron that receives messages.
Dendrite
Which nerve carries messages from the CNS to muscles/glands?
Motor nueron
The pathway of a reflex action is called?
Reflex arc
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.
What is the role of the myelin sheath?
The myelin sheath provides insulation and increases the speed of nerve impulse conduction.
Define reflex action in one line.
Quick, automatic, involuntary response to a stimulus
Which structure connects the brain to the spinal cord?
Medulla oblongata
If a person has difficulty maintaining balance after an accident, which part of the brain is most likely damaged?
Cerebellum
How many pairs of spinal nerves are there in humans?
31 pairs
Give one example of a reflex action.
Withdrawing hand from a hot objec
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
In a reflex arc, the relay neuron is found in the:
Spinal cord
What is the main importance of the nervous system in the body?
It controls and coordinates all activities of the body
Name one voluntary action controlled by the nervous system.
Walking, writing, or talking.
Which nerve carries messages from sense organs to the brain/spinal cord?
Sensory neuron
The structural and functional unit of the nervous system is:
Neuron
A student suddenly touches a sharp thorn and pulls the hand away without thinking. Which sequence shows the correct pathway?