NEET 2025 MCQ with Answer Explanation : “Neural control and Coordination”.

MCQ 121:
What is the main role of the blood-brain barrier?

A) Preventing nutrient absorption
B) Protecting the brain from pathogens and toxins
C) Facilitating neurotransmitter release
D) Regulating blood flow to the brain

Answer: B) Protecting the brain from pathogens and toxins

Explanation: The blood-brain barrier selectively allows substances to enter the brain, protecting it from harmful substances while allowing essential nutrients to pass.

MCQ 122:
Which part of the brain controls voluntary movements and is involved in decision-making?

A) Cerebellum
B) Frontal lobe
C) Occipital lobe
D) Brainstem

Answer: B) Frontal lobe

Explanation: The frontal lobe is critical for controlling voluntary movements, planning, and decision-making.

MCQ 123:
Which type of brain imaging technique measures brain activity by detecting changes in blood flow?

A) CT scan
B) MRI
C) PET scan
D) EEG

Answer: C) PET scan

Explanation: PET (positron emission tomography) scans measure brain activity by detecting changes in blood flow, indicating areas of increased neuronal activity.

MCQ 124:
What is the primary function of the pons in the brainstem?

A) Controlling reflexes
B) Relaying signals between the cerebellum and the rest of the brain
C) Regulating heart rate
D) Processing visual information

Answer: B) Relaying signals between the cerebellum and the rest of the brain

Explanation: The pons acts as a bridge for communication between different parts of the brain, particularly between the cerebellum and the cerebrum.

MCQ 125:
Which part of the brain is involved in regulating sleep and wakefulness?

A) Hypothalamus
B) Cerebellum
C) Medulla oblongata
D) Amygdala

Answer: A) Hypothalamus

Explanation: The hypothalamus regulates sleep-wake cycles and other circadian rhythms by controlling hormone secretion.

MCQ 126:
What type of receptor responds to mechanical pressure or distortion?

A) Thermoreceptor
B) Photoreceptor
C) Mechanoreceptor
D) Chemoreceptor

Answer: C) Mechanoreceptor

Explanation: Mechanoreceptors detect mechanical changes such as pressure, touch, and vibration, allowing the body to sense physical stimuli.

MCQ 127:
Which part of the brain is primarily responsible for processing smells?

A) Occipital lobe
B) Frontal lobe
C) Temporal lobe
D) Olfactory bulb

Answer: D) Olfactory bulb

Explanation: The olfactory bulb processes smells and transmits olfactory information to other brain areas.

MCQ 128:
What is the role of the spinal reflex arc?

A) Connecting the brain to the sensory organs
B) Transmitting sensory information to the brain
C) Allowing quick responses to stimuli without brain involvement
D) Coordinating complex motor activities

Answer: C) Allowing quick responses to stimuli without brain involvement

Explanation: The spinal reflex arc enables rapid reactions to stimuli by bypassing the brain, allowing for immediate responses.

MCQ 129:
Which part of the eye adjusts to control the amount of light entering?

A) Retina
B) Iris
C) Cornea
D) Lens

Answer: B) Iris

Explanation: The iris controls the size of the pupil, adjusting the amount of light that enters the eye.

MCQ 130:
What is the primary role of the visual cortex?

A) Processing sound
B) Interpreting visual information
C) Regulating body temperature
D) Controlling balance

Answer: B) Interpreting visual information

Explanation: The visual cortex processes and interprets visual signals received from the retina.