1. What is the main function of a motor neuron?
A.
To carry impulses from receptors to the CNS
B.
To carry impulses from the CNS to an effector
C.
To produce hormones in the blood
D.
To protect the brain from injury
Correct Answer:
To carry impulses from the CNS to an effector
Explanation:
Motor neurons transmit nerve impulses away from the central nervous system to effectors such as muscles or glands.
2. Motor neurons are also called which type of neurons?
A.
Afferent neurons
B.
Sensory neurons
C.
Efferent neurons
D.
Receptor neurons
Correct Answer:
Efferent neurons
Explanation:
Motor neurons are called efferent neurons because they carry impulses away from the central nervous system.
3. Which structure is commonly controlled by a somatic motor neuron?
A.
Skeletal muscle
B.
Stomach lining
C.
Blood plasma
D.
Sensory receptor
Correct Answer:
Skeletal muscle
Explanation:
Somatic motor neurons carry impulses to skeletal muscles, allowing voluntary body movements.
4. A motor neuron carries impulses in which direction?
A.
From an effector to the CNS
B.
From the CNS to an effector
C.
From one receptor to another receptor
D.
From a gland to the sensory organ
Correct Answer:
From the CNS to an effector
Explanation:
The direction of a motor impulse is from the brain or spinal cord to an effector such as a muscle or gland.
5. Which of the following is an effector reached by motor neurons?
A.
Skeletal muscle
B.
Retina
C.
Skin receptor
D.
Cochlea
Correct Answer:
Skeletal muscle
Explanation:
Motor neurons deliver commands to effectors, and skeletal muscles are important effectors that produce movement.
6. Motor neurons involved in involuntary control may act on which tissue?
A.
Smooth muscle
B.
Hair receptor only
C.
Optic nerve
D.
Bone tissue only
Correct Answer:
Smooth muscle
Explanation:
Autonomic motor neurons control involuntary effectors such as smooth muscle, cardiac muscle, and glands.
7. The cell body of a typical motor neuron is generally located in which part of the nervous system?
A.
A sensory receptor
B.
The central nervous system
C.
A muscle fibre
D.
The skin surface
Correct Answer:
The central nervous system
Explanation:
The cell body of a typical motor neuron is located in the brain or spinal cord, which together form the central nervous system.
8. Which part of a motor neuron usually carries impulses away from its cell body?
A.
Dendrite
B.
Cell nucleus
C.
Axon
D.
Synaptic vesicle
Correct Answer:
Axon
Explanation:
The axon carries nerve impulses away from the motor neuron's cell body toward an effector.
9. Which type of motor neuron is mainly responsible for voluntary movement?
A.
Somatic motor neuron
B.
Sensory neuron
C.
Receptor neuron
D.
Interneuron only
Correct Answer:
Somatic motor neuron
Explanation:
Somatic motor neurons control skeletal muscles and are involved in voluntary movements.
10. Autonomic motor neurons help control which of the following?
A.
Only conscious movement of bones
B.
Smooth muscle, cardiac muscle, and glands
C.
Only sensory receptors in the skin
D.
Only the protective coverings of the brain
Correct Answer:
Smooth muscle, cardiac muscle, and glands
Explanation:
Autonomic motor neurons regulate involuntary effectors, including smooth muscle, cardiac muscle, and glands.
Short questions are currently unavailable for this page.