Biology

Nervous System and Neurons

1,164 Questions

The nervous system and neurons section covers the structural and functional aspects of the human nervous system. Topics include nerve fibers, the myelin sheath, and sympathetic nervous system functions. This material is crucial for general science preparation in various competitive exams.

Neuron structureMyelin sheath productionSympathetic nervous systemCranial and spinal nervesParasympathetic functions

Nervous System and Neurons Questions

Multiple choice

Which of the following neurons generate action potentials regardless of stimulus amplitude or duration?

  1. Tonic neurons

  2. Phasic neurons

  3. GABAergic neurons

  4. Fast spiking

  5. Thin-spike neurons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

These neurons fire in bursts. They generate action potentials for a brief time period at the onset of a stimulus and regardless of stimulus amplitude or duration, and hence behave as signal detectors. Typical example are retinal ganglion cells (neurons).

Multiple choice

The process through which a neuron summates synaptic excitation and inhibition is termed as _________.

  1. plasticity

  2. itegration

  3. convergence

  4. disinhibition

  5. inhibition
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 The nervous system combines information from the different senses (vision, hearing touch, etc), and each part of the brain combines information from many other parts of the brain. All this take place because neurons have dendrites, which are designed to combine or integrate information.

Multiple choice

Which of the following processes controls the amount of neurotransmitter released from a nerve ending on a short-term, i.e. minute-to-minute basis?

  1. Actin availability

  2. Calcium inavailability

  3. Axoplasmic transport

  4. Vesicle synthesis in the cell soma

  5. Neurotransmitter synthesis
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Because there is only sufficient neurotransmitter available in a nerve ending for a minute or so of continued released, the biosynthesis of new neurotransmitter to fill the recycled neurotransmitter vesicle is necessary for continued availability of neurotransmitter for release.