Tag: structure of neuron

Questions Related to structure of neuron

The function of an axon is 

  1. Transformation of nerve impulse

  2. Reception of stimuli from neurons

  3. Reception of external stimuli

  4. Conduction of nerve impulse


Correct Option: D
Explanation:

An axon is also known as a nerve fiber. It is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body. The function of the axon is to transmit information to different neurons, muscles and glands.

Sheath of Schwann occurs on 

  1. Neurons

  2. Axons

  3. Dendrons

  4. Neuroglia


Correct Option: B
Explanation:

Schwann cells also called as neurolemmocytes are the principal glia of the peripheral nervous system (PNS). Myelinating Schwann cells wrap around axons of motor and sensory neurons to form the myelin sheath. 

What used to be described as Nissl granules in a nerve cell are now identified as?

  1. Cell metabolites

  2. Fat granules

  3. Ribosomes

  4. Mitochondria


Correct Option: C
Explanation:

A Nissl granule is a large granular body found in neurons. These granules are rough endoplasmic reticulum (RER) with rosettes of free ribosomes and are the site of protein synthesis.

Dendrites are associated with which system?

  1. Nervous system

  2. Digestive system

  3. Muscular system

  4. Blood vascular system


Correct Option: A
Explanation:

Dendrites are the branched projections of a neuron, that act to propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project.

The Nissl granules of nerve cells are made up of 

  1. Ribosome

  2. Protein

  3. DNA

  4. Mitochondria


Correct Option: A
Explanation:

A Nissl granule is a large granular body found in neurons. These granules are rough endoplasmic reticulum (RER) with rosettes of free ribosomes and are the site of protein synthesis.

Nissl granules are found in 

  1. Liver cells

  2. Nerve cells

  3. Kidney

  4. Heart


Correct Option: B
Explanation:

A Nissl body is also known as Nissl or tigroid substance. It is a large granular body found in neurons. These granules are rough endoplasmic reticulum (RER) with rosettes of free ribosomes and are the sites of protein synthesis.

Nissl's granules are

  1. RNA bodies

  2. DNA

  3. Carbohydrate

  4. Protein


Correct Option: A
Explanation:

A Nissl body is also known as Nissl or tigroid substance. It is a large granular body found in neurons. These granules are rough endoplasmic reticulum (RER) with rosettes of free ribosomes and are the site of protein synthesis.

"Nodes of Ranvier" are found in 

  1. Brain

  2. Heart

  3. Axon

  4. Eye


Correct Option: C
Explanation:

The node of Ranvier is a periodic gap in the insulating sheath on the axon of certain neurons that serves to facilitate the rapid conduction of nerve impulses. These interruptions in the myelin covering were first discovered in 1878 by French histologist and pathologist Louis Antoine Ranvier, who describes the nodes as constrictions. They are present in myelinated nerves.

Power of regeneration is lowest in 

  1. Brain cell

  2. Liver cell

  3. Bone cell

  4. Muscle cell


Correct Option: A
Explanation:

The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. In a typical human, the cerebral cortex is estimated to contain 15-33 billion neurons, each connected by synapses to several thousand other neurons. These  neurons communicate with one another by means of long protoplasmic fibers called axons, which carry trains of signal pulses called action potentials to distant parts of the brain or body targeting specific recipient cells. These brain cells are the only cells which do not have the ability to regenerate.

Therefore, the correct answer is option A.

What is the function of neuron?

  1. It helps in conducting impulses.

  2. It helps in regulating control and coordination in the animals.

  3. Both A and B.

  4. None of the above.


Correct Option: C
Explanation:

A neuron is an electrically excitable cell. It processes and transmits information through electrical and chemical signals. These signals between neurons occur via synapses, specialized connections with other cells. Neurons can connect to each other to form neural networks. Neurons are the core components of the nervous system, which includes the brain, spinal cord which together comprise the central nervous system (CNS) and the ganglia of the peripheral nervous system (PNS). Specialized types of neurons include: sensory neurons which respond to touch, sound, light and all other stimuli affecting the cells of the sensory organs that then send signals to the spinal cord and brain, motor neurons that receive signals from the brain and spinal cord to cause muscle contractions and affect glandular outputs and interneurons which connect neurons to other neurons within the same region of the brain or spinal cord in neural networks.
Therefore, the correct answer is option C.