Tag: nervous system in animals

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Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

Neurilemma is name for :

  1. Plasmamembrane of axon

  2. Coating formed by myelin sheath

  3. Covering of schwann cells

  4. Connective tissue covering of nerve fasciculus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Neurilemma is the outermost covering of Schwann cells that surrounds the axon of the neuron. It is also known as neurolemma.

Thus, the correct answer is 'Covering formed by Schwann cells.'

Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

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

  1. Vacuoles and fibres

  2. Flagellum and medullary sheath

  3. Nucleus and mitochondria

  4. Perikaryon and dendrites
Reveal answer Fill a bubble to check yourself
D 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 D.

Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

In peripheral nervous system, the nerves are made up exclusively from the

  1. Dendrons

  2. Axons

  3. Nodes of Ranvier

  4. Nissl body
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nerves are made up of bundles of the axons of nerve cells. A nerve is an enclosed, cable-like bundle of axons (long, slender projections of neurons) in the peripheral nervous system.

Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

'Nodes of Ranvier' are found in 

  1. Brain

  2. Heart

  3. Axon

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

Nodes of Ranvier are periodic gaps in the insulating sheath (myelin) on the axon of certain neurons, that serves to facilitate the rapid conduction of nerve impulses. 

The action potential propagated by one node of Ranvier jumps to and is regenerated at the next node along the axon, thereby enabling the action potential to travel rapidly along the fiber.

Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function 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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

Dendrites are associated with which system?

  1. Nervous system

  2. Digestive system

  3. Muscular system

  4. Blood vascular system
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

Nissl granules are found in 

  1. Liver cells

  2. Nerve cells

  3. Kidney

  4. Heart
Reveal answer Fill a bubble to check yourself
B Correct answer
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.