Prepare for NEET Biology Neural Control And Coordination with MCQs & PYQs on NEET.GUIDE. Enjoy free practice, previous year questions, and expert guidance on neurons and synapses.
A patient presents with impaired coordination of voluntary movements, slurred speech, and difficulty maintaining balance. Damage to which specific brain region is MOST likely responsible for these symptoms?
Cerebrum
Medulla Oblongata
Cerebellum
Hypothalamus
During a stressful situation, a person experiences increased heart rate, rapid breathing, and dilated pupils. Which neurotransmitter is PRIMARILY responsible for mediating these physiological responses?
Acetylcholine
Dopamine
Serotonin
Norepinephrine
A lesion in the Broca's area of the brain would MOST likely result in which of the following deficits?
Loss of sensory perception
Impaired comprehension of language
Difficulty in speech production
Inability to recognize faces
Which of the following is NOT a function of the limbic system?
Regulation of emotions
Formation of memories
Motivation and reward
Regulation of body temperature
The resting membrane potential of a neuron is primarily maintained by the activity of which membrane proteins?
Voltage-gated sodium channels
Voltage-gated potassium channels
Sodium-potassium pumps
Ligand-gated chloride channels
A demyelinating disease, such as multiple sclerosis, primarily affects which component of the nervous system and impairs what function?
Synaptic cleft; neurotransmitter release
Neuron cell body; protein synthesis
Myelin sheath; nerve impulse conduction
Dendrites; signal reception
A neuron poisoned with tetrodotoxin (TTX) is stimulated. Which of the following would be observed?
Normal action potential generation
Delayed action potential generation
No action potential generated due to blocked channels
Hyperexcitability and spontaneous action potentials
Which statement BEST describes the role of the Nodes of Ranvier in saltatory conduction?
They insulate the axon, preventing ion leakage.
They synthesize neurotransmitters for synaptic transmission.
They allow for faster action potential propagation by concentrating voltage-gated channels.
They slow down action potential propagation, allowing for greater control.
An experimental drug selectively inhibits the function of astrocytes. What direct consequence would MOST likely be observed in neuronal function?
Increased rate of neurotransmitter synthesis
Enhanced myelination of axons
Impaired regulation of the extracellular ionic environment
Accelerated action potential propagation
In a demyelinating disease like multiple sclerosis, which characteristic of nerve impulse conduction is MOST directly affected?
Resting membrane potential
Threshold potential
Conduction velocity
Neurotransmitter release
