Prepare for NEET Biology Structural Organisation In Animals (Neural Tissue) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert solutions to analyze neurons, synapses, and nerve impulse conduction.
NEET Questions / Zoology / Structural Organisation In Animals / Neural Tissue
A scientist is studying the effects of a novel neurotoxin on isolated neurons. The toxin selectively inhibits the anterograde axonal transport of vesicles containing neuropeptides. Which of the following processes would be MOST directly affected?
Myelination of the axon
Retrograde transport of growth factors
Synaptic transmission involving neuropeptides
Sodium-potassium pump activity
Which specific characteristic distinguishes the Nodes of Ranvier from the rest of the myelinated axon in terms of ion channel distribution?
High density of voltage-gated potassium channels
High density of voltage-gated sodium channels
Absence of ion channels
Presence of ligand-gated chloride channels
A patient presents with impaired coordination and balance. MRI reveals lesions specifically affecting the cerebellar Purkinje cells. Disruption of which neurotransmitter system is MOST likely contributing to the observed symptoms?
Cholinergic
Dopaminergic
GABAergic
Glutamatergic
A researcher is investigating the role of astrocytes in regulating synaptic transmission. Which of the following is NOT a function typically attributed to astrocytes in this context?
Recycling of neurotransmitters
Regulation of extracellular ion concentrations
Direct release of neurotransmitters into the synaptic cleft
Maintenance of the blood-brain barrier
Mutations in the gene encoding for connexin proteins can lead to various neurological disorders. Which aspect of neural function would be MOST directly affected by abnormal connexin function?
Axonal transport of neurotransmitters
Synthesis of myelin sheath components
Electrical coupling between adjacent neurons
Reuptake of neurotransmitters from the synaptic cleft
Which of the following is NOT a characteristic of neurons?
High rate of cell division
Longevity
Amitotic nature
High metabolic rate
The function of Schwann cells is to:
Form myelin sheath around axons in the PNS
Form myelin sheath around axons in the CNS
Produce cerebrospinal fluid
Act as phagocytes in the nervous system
Which part of the neuron transmits signals away from the cell body?
Axon
Dendrites
Soma
Synapse
What is the function of the Nodes of Ranvier?
Facilitate saltatory conduction
Produce neurotransmitters
Store neurotransmitters
Synthesize myelin
Which type of neuron transmits impulses from the CNS to effector organs?
Motor neuron
Sensory neuron
Interneuron
Neuroglia
