Biology

Nervous System and Neurons

1,224 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

Ejaculation is a function of

  1. sensory nervous system

  2. somatic nervous system

  3. sympathetic nervous system

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ejaculation is a function of sympathetic nervous system.

Multiple choice

Peripheral nervous system consists of:

  1. cranial nerves only

  2. spinal nerves only

  3. both cranial and spinal nerves

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Peripheral nervous system consists of spinal nerves only.The peripheral nervous system (PNS) is the part of the nervous system that consists of the nerves and ganglia outside of the brain and spinal cord.

Multiple choice

During depolarisation, permeability of neuron increases towards

  1. H+

  2. Na+

  3. Ag+

  4. Mg++
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During depolarisation, permeability of neuron increases towards Na+, which changes the electrochemical gradient, which in turn produces a further rise in the membrane potential. This then causes more channels to open, producing a greater electric current across the cell membrane, and so on.

Multiple choice

The largest cranial nerve in human beings is the

  1. optic nerve

  2. facial nerve

  3. trigeminal nerve

  4. mandibular nerve
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The largest cranial nerve in human beings is the trigeminal nerve. It has three major branches: the ophthalmic nerve (V1), the maxillary nerve (V2), and the mandibular nerve (V3).

Multiple choice

Which is the longest cranial nerve?

  1. Trochlear

  2. Trigeminal

  3. Vagus

  4. Vestibular
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct because vagus has the maximum number of branches and it is also known as wondering nerve.

Multiple choice

Auditory nerve is formed by

  1. vestibular and trochlear nerve

  2. cochlear nerve

  3. trochlear and cochlear nerve

  4. vestibular and cochlear nerve
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because auditory nerve is formed by the union of vestibular nerve and the cochlear nerve.

Multiple choice

Unipolar neurons are present in

  1. dorsal root ganglia of spinal cord

  2. retina of eye

  3. olfactory epithelium

  4. grey matter of brain
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the region where unipolar neurons are present.