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.
The myelin sheath, which insulates axons, is primarily composed of:
Proteins
Carbohydrates
Lipids
Nucleic Acids
What is the primary function of the Nodes of Ranvier?
Neurotransmitter synthesis
Saltatory conduction of nerve impulses
Production of myelin
Storage of neurotransmitters
Which type of neuron transmits signals from the central nervous system to effector organs like muscles?
Sensory neuron
Interneuron
Motor neuron
Glial cell
What is the role of neurotransmitters in nerve impulse transmission?
Electrical signals that travel along axons
Insulating material for axons
Chemical messengers that transmit signals across synapses
Structural components of the neuron
A patient experiences difficulty hearing high-frequency sounds but can perceive low-frequency sounds normally. Damage to which specific area of the cochlea is MOST likely responsible for this condition?
Base of the cochlea
Apex of the cochlea
Organ of Corti throughout the cochlea
Helicotrema
A researcher is studying the effects of a novel ototoxic drug on the inner ear. Which of the following findings would be LEAST expected if the drug specifically targets the outer hair cells?
Reduced amplification of basilar membrane vibrations
Broadening of auditory tuning curves
Loss of afferent nerve fiber activity
Decreased sensitivity to quiet sounds
A lesion in the medial geniculate nucleus (MGN) of the thalamus would MOST likely result in:
Conduction deafness
Impaired processing of auditory information before it reaches the cortex
Loss of vestibular function
Disruption of the attenuation reflex
Which of the following combinations correctly matches the inner ear structure with its primary function?
Utricle and Saccule - Angular acceleration; Semicircular canals - Linear acceleration
Utricle and Saccule - Sound detection; Semicircular canals - Balance
Utricle and Saccule - Linear acceleration; Semicircular canals - Angular acceleration
Utricle and Saccule - Static equilibrium; Semicircular canals - Sound detection
Endolymph, a unique fluid found within the membranous labyrinth of the inner ear, is characterized by its unusually high concentration of which ion?
Na+
K+
Cl-
Ca2+
Damage to the stapedius muscle would MOST likely result in which of the following?
Conduction deafness
Sensorineural hearing loss
Hyperacusis (increased sensitivity to loud sounds)
Tinnitus
