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 zoology nervous system of man pns divisions of nervous system peripheral nervous system

3rd, 6th and 11th cranial nerves are

  1. Optic, facial and accessory spinal

  2. Oculomotor, trigeminal and accessory spinal

  3. Trigeminal, abducens and vagus

  4. Oculomotor, abducens and accessory spinal
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The 3rd cranial nerve is the Oculomotor nerve, the 6th is the Abducens nerve, and the 11th is the Accessory (spinal accessory) nerve.

Multiple choice zoology nervous system of man pns divisions of nervous system peripheral nervous system

The $3^{rd}, 6^{th} and 11^{th}$ cranial nerves are respectively

  1. oculomotor, abducens and accessory

  2. oculomotor, trigeminal and accessory

  3. optic, facial and accessory

  4. trochlear, abducens and vagus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In higher vertebrates (reptiles, birds, mammals) there are 12 pairs of cranial nerves- olfactory (I), optic (II), oculomotor (III), trochlear (IV), trigeminal (V), abducens (VI), facial (VII), vestibulocochlear (VIII), glossopharyngeal (IX), vagus (X), accessory (XI), and hypoglossal (XII).

Multiple choice zoology nervous system of man pns divisions of nervous system peripheral nervous system

The vagus nerve is the _______ cranial nerve.

  1. $7^{th}$
  2. $5^{th}$
  3. $10^{th}$
  4. $9^{th}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The vagus nerve historically cited as the pneumogastric nerve, is the tenth cranial nerve or CN X, and interfaces with parasympathetic control of the heart, lungs, and digestive tract. The vagus nerves are paired but are normally referred to in the singular. It is the longest nerve of the autonomic nervous system in the human body.


So the correct option is '10th'.

Multiple choice biology caskets of life the cell structure cytoplasm unicellular and multicellular organisms number and shape of cells

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell ?


  1. Nucleus and mitochondria

  2. Perikaryon and dendrites

  3. Vacuoles and fibres

  4. Flagellum and medullary sheath
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The vacuole is membrane bound organelle present in all plant and fungal cells and some protist, animal and bacterial cells. The flagellum is an appendage, that protrudes from the cell body of certain prokaryotic and some eukaryotic cells. Nucleus and mitochondria are membrane bound organelles present in almost all cells. 
Perikaryon, also called cyton is the bulbous end of a neuron containing cell nucleus. Dendrites are the short cytoplasmic processes of the cell body of the neuron, which receives stimulus from other neurons.
So, the correct answer is option B.
Multiple choice zoology tissue level of organisation specialized cells in animals tissues and types of tissues levels of organisation in animals

The direction of impulse in a typical neuron is

  1. Axon to dendron

  2. Dendron to axon

  3. Both A and B

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

In a typical neuron, the incoming signals are first taken up by the dendrites and they are then passed on to the axons via the neuron body. 

Image result for The direction of impulse in a typical neuron is

So, the correct answer is 'Dendron to axon'. 

Multiple choice zoology structural organization in living organisms specialized cells in animals tissues and types of tissues levels of organisation in animals

The integral component of the nervous tissue is 

  1. Axon

  2. Neuron

  3. Cyton

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The nervous system has a function in the control and coordination of the body. It consists of nervous tissue. Nervous tissues contain highly specialized cells called neurons or nerve cells. 
So, the correct answer is 'Neurons'.
Multiple choice zoology structural organization in living organisms specialized cells in animals tissues and types of tissues levels of organisation in animals

Cell body is known as

  1. Axon

  2. Cyton

  3. Neuron

  4. None of he above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Neurons are made up of three parts: cell body, dendrites, and axon. The cell body is also known as cyton consists of nucleus and cytoplasm. Dendrites are short branches arising from cell body whereas axon is a long cylindrical projection of uniform thickness.
So, the correct answer is 'Cyton'.
Multiple choice zoology structural organization in living organisms specialized cells in animals tissues and types of tissues levels of organisation in animals

The bundle of axon is known as

  1. Nerve

  2. Cyton

  3. Axon

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Axon is a part of nerve cells or neurons. The bundle of the axon is called a nerve in the peripheral nervous system while it is called a tract in the central nervous system. 
So, the correct answer is 'Nerve'
Multiple choice frog - control and coordination system frog animal diversity - ii (phylum: chordata) organ and organ systems in animals zoology

One of the examples of the action of the autonomous neural system is ____________.

  1. Swallowing of food

  2. Pupillary reflex

  3. Peristalsis of the intestine

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Autonomous neural system controls and coordinates the involuntary activities of various organs. It regulates involuntary activities of the body i.e., activities that are not under the will power of the animal, e.g. swallowing of food, pupillary reflex, peristalsis of the intestine, etc.