Q. In a simple reflex arc, which neuron type directly stimulates a muscle to contract?
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A.
Sensory neuron
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B.
Interneuron
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C.
Motor neuron
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D.
Efferent neuron
Solution
In a simple reflex arc, the motor neuron directly stimulates a muscle to contract, resulting in a reflex action.
Correct Answer:
C
— Motor neuron
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Q. What is the function of the stretch reflex?
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A.
To protect the body from injury
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B.
To maintain muscle tone and posture
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C.
To enhance muscle strength
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D.
To facilitate voluntary movement
Solution
The stretch reflex helps maintain muscle tone and posture by automatically adjusting muscle length in response to stretching.
Correct Answer:
B
— To maintain muscle tone and posture
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Q. What is the primary function of a reflex arc?
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A.
To process sensory information in the brain
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B.
To initiate voluntary muscle movement
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C.
To provide a rapid response to stimuli
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D.
To regulate hormonal levels
Solution
The primary function of a reflex arc is to provide a rapid response to stimuli, allowing for quick reactions without the need for conscious thought.
Correct Answer:
C
— To provide a rapid response to stimuli
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Q. What is the primary neurotransmitter involved in muscle contraction at the neuromuscular junction?
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A.
Dopamine
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B.
Serotonin
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C.
Acetylcholine
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D.
Norepinephrine
Solution
Acetylcholine is the primary neurotransmitter involved in muscle contraction at the neuromuscular junction.
Correct Answer:
C
— Acetylcholine
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Q. What is the role of interneurons in a reflex arc?
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A.
To transmit signals to the brain
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B.
To connect sensory and motor neurons
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C.
To inhibit reflex actions
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D.
To enhance muscle contraction
Solution
Interneurons connect sensory and motor neurons within the spinal cord, facilitating the reflex response.
Correct Answer:
B
— To connect sensory and motor neurons
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Q. What type of neuron carries signals from sensory receptors to the spinal cord?
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A.
Motor neurons
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B.
Interneurons
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C.
Sensory neurons
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D.
Efferent neurons
Solution
Sensory neurons carry signals from sensory receptors to the spinal cord, initiating the reflex arc.
Correct Answer:
C
— Sensory neurons
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Q. Which of the following best describes the withdrawal reflex?
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A.
A reflex that involves multiple synapses
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B.
A reflex that is always voluntary
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C.
A reflex that only involves one muscle group
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D.
A reflex that occurs without sensory input
Solution
The withdrawal reflex involves multiple synapses and is a polysynaptic reflex that allows for a coordinated response to painful stimuli.
Correct Answer:
A
— A reflex that involves multiple synapses
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Q. Which part of the nervous system is primarily involved in reflex actions?
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A.
Central nervous system
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B.
Peripheral nervous system
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C.
Autonomic nervous system
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D.
Somatic nervous system
Solution
Reflex actions primarily involve the central nervous system, which includes the brain and spinal cord, where reflex arcs are processed.
Correct Answer:
A
— Central nervous system
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Q. Which reflex is an example of a monosynaptic reflex?
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A.
Withdrawal reflex
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B.
Knee-jerk reflex
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C.
Pupillary reflex
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D.
Crossed extensor reflex
Solution
The knee-jerk reflex is an example of a monosynaptic reflex, involving only one synapse between the sensory and motor neurons.
Correct Answer:
B
— Knee-jerk reflex
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