biology : class11 Afferent Pathways : CNS, PNS, Visceral Nervous System : Human Nervous System MCQ Questions and Answers
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Afferent Pathways
MCQ questions and answers.
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MCQ Questions
1. What is the main function of an afferent pathway?
A.
To carry sensory impulses toward the central nervous system
B.
To carry motor impulses away from the central nervous system
C.
To produce hormones in endocrine glands
D.
To connect muscles directly to bones
Correct Answer:
To carry sensory impulses toward the central nervous system
Explanation:
Afferent pathways carry sensory information from receptors in the body toward the brain and spinal cord.
2. Which type of neuron usually carries impulses in an afferent pathway?
A.
Sensory neuron
B.
Motor neuron
C.
Relay neuron only
D.
Muscle cell
Correct Answer:
Sensory neuron
Explanation:
Sensory neurons transmit impulses from sensory receptors to the central nervous system through afferent pathways.
3. Afferent impulses generally travel in which direction?
A.
From receptors to the central nervous system
B.
From the central nervous system to muscles
C.
From muscles to glands only
D.
From one bone to another
Correct Answer:
From receptors to the central nervous system
Explanation:
The term afferent refers to information entering the central nervous system from sensory receptors.
4. Which structure detects a stimulus and begins an afferent impulse?
A.
Sensory receptor
B.
Motor end plate
C.
Skeletal muscle
D.
Synaptic vesicle
Correct Answer:
Sensory receptor
Explanation:
Sensory receptors detect changes such as touch, temperature, or pain and initiate impulses in afferent pathways.
5. Which sensation is carried to the central nervous system by an afferent pathway?
A.
Touch
B.
Muscle contraction command
C.
Hormone secretion command
D.
Voluntary movement instruction
Correct Answer:
Touch
Explanation:
Touch is a sensory stimulus, so information about it travels from receptors to the central nervous system through an afferent pathway.
6. The cell bodies of many spinal sensory neurons are located in the:
A.
Dorsal root ganglia
B.
Ventral root ganglia
C.
Adrenal glands
D.
Neuromuscular junctions
Correct Answer:
Dorsal root ganglia
Explanation:
Dorsal root ganglia contain the cell bodies of many sensory neurons whose axons carry afferent impulses into the spinal cord.
7. Which pathway carries information about the stretching of a muscle to the central nervous system?
A.
Afferent pathway
B.
Efferent pathway
C.
Endocrine pathway
D.
Digestive pathway
Correct Answer:
Afferent pathway
Explanation:
Information about muscle stretch is sensory information and is carried from receptors to the central nervous system by an afferent pathway.
8. Visceral afferent pathways carry sensory information from the:
A.
Internal organs
B.
Bones only
C.
Skin only
D.
Central nervous system to skeletal muscles
Correct Answer:
Internal organs
Explanation:
Visceral afferent pathways transmit sensory information from internal organs to the central nervous system.
9. Pain information from the skin reaches the spinal cord through a:
A.
Somatic afferent pathway
B.
Somatic efferent pathway
C.
Visceral efferent pathway
D.
Hormonal pathway
Correct Answer:
Somatic afferent pathway
Explanation:
Somatic afferent pathways carry sensory information such as pain from the skin and other body-wall structures to the central nervous system.
10. Which statement correctly describes an afferent nerve fiber?
A.
It carries sensory information toward the central nervous system
B.
It carries commands from the spinal cord to a muscle
C.
It releases digestive enzymes into the intestine
D.
It connects two bones at a joint
Correct Answer:
It carries sensory information toward the central nervous system
Explanation:
An afferent nerve fiber conducts sensory impulses from receptors toward the brain or spinal cord.
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