MCQ 81:
Which type of glial cell forms the myelin sheath in the central nervous system?
A) Schwann cells
B) Astrocytes
C) Oligodendrocytes
D) Microglia
Answer: C) Oligodendrocytes
Explanation: Oligodendrocytes are responsible for forming the myelin sheath that insulates axons in the central nervous system, allowing for faster signal transmission.
MCQ 82:
What is the primary function of the parietal lobe?
A) Processing sensory information related to touch, temperature, and pain
B) Coordinating balance and movement
C) Regulating emotions
D) Processing visual information
Answer: A) Processing sensory information related to touch, temperature, and pain
Explanation: The parietal lobe integrates sensory information from various modalities, particularly related to touch and spatial awareness.
MCQ 83:
Which neurotransmitter is known for its role in muscle contraction?
A) Serotonin
B) Acetylcholine
C) Dopamine
D) GABA
Answer: B) Acetylcholine
Explanation: Acetylcholine is the neurotransmitter that stimulates muscle contractions at the neuromuscular junction.
MCQ 84:
Which structure in the eye is responsible for color vision?
A) Rods
B) Cones
C) Cornea
D) Lens
Answer: B) Cones
Explanation: Cones are photoreceptor cells in the retina responsible for color vision and function best in bright light.
MCQ 85:
What is the primary role of the amygdala?
A) Processing visual information
B) Regulating motor functions
C) Processing emotions and fear responses
D) Controlling sleep patterns
Answer: C) Processing emotions and fear responses
Explanation: The amygdala is involved in emotional processing, particularly fear and pleasure responses.
MCQ 86:
Which type of receptor is responsible for detecting changes in light intensity?
A) Thermoreceptor
B) Mechanoreceptor
C) Photoreceptor
D) Chemoreceptor
Answer: C) Photoreceptor
Explanation: Photoreceptors, such as rods and cones in the retina, detect light intensity and contribute to vision.
MCQ 87:
Which part of the brain is involved in regulating balance and coordination?
A) Cerebellum
B) Brainstem
C) Frontal lobe
D) Thalamus
Answer: A) Cerebellum
Explanation: The cerebellum plays a crucial role in maintaining balance and coordinating smooth, voluntary movements.
MCQ 88:
What is the primary function of sensory neurons?
A) To transmit signals from the brain to muscles
B) To connect different parts of the nervous system
C) To carry signals from sensory receptors to the central nervous system
D) To provide structural support to neurons
Answer: C) To carry signals from sensory receptors to the central nervous system
Explanation: Sensory neurons transmit sensory information from receptors (e.g., skin, eyes) to the central nervous system for processing.
MCQ 89:
Which of the following is an inhibitory neurotransmitter in the central nervous system?
A) Norepinephrine
B) Serotonin
C) GABA
D) Acetylcholine
Answer: C) GABA
Explanation: GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the central nervous system, helping to reduce neuronal excitability.
MCQ 90:
What is the primary function of the thalamus?
A) Processing olfactory signals
B) Relaying sensory information to the cerebral cortex
C) Controlling heart rate
D) Regulating sleep cycles
Answer: B) Relaying sensory information to the cerebral cortex
Explanation: The thalamus acts as a relay station for sensory information (except for smell) before it is processed by the cerebral cortex.
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