Tag: structure of neuron

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

Which of the following tissues in mammals show least capacity for regeneration?

  1. Blood

  2. Bone

  3. Nerve

  4. Cartilage
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The different cells in the body can regenerate in order to replace the damaged or the worn-out cells. 
  • The neurons are one of the brain cells. The cells divide during the embryonal stage. After the birth of a child, the cells lose their capacity to divide. 
  • These cells have the least capacity of regeneration. 
  • Thus, the correct answer is option C. 
Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

Myelin sheath is a layer covering

  1. A nerve fibre in a vertebrate

  2. A chick embryo

  3. A muscle fibre in a vertebrate

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The axon can be defined as the long cytoplasmic process of the cell body, which transmits the impulse from the cell body to other neurons. The axon of the neuron is covered by a lipid-rich membrane, called myelin sheath. The myelin sheath is formed by Schwann cells and each Schwann cell covers a part of the axon.
Thus, the correct answer is the option D.

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

Nerve cells do not possess

  1. Neurilemma

  2. Sarcolemma

  3. Dendrite

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

Cells of the nervous system are called nerve cells or neurons. Neurons have specialized cell parts, called dendrites and axons. A thin sheath covers the axon of the nerve cell. This sheath is called as neurilemma. The sarcolemma also called the myolemma, is the cell membrane of a striated muscle fiber cell. It is not present in the nerve cell. 

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

The outer covering of non-myelinated neurons in brain is?

  1. Neurilemma

  2. Axolemma

  3. Oolemma

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

Unlike unmyelinated axons in periphary nerves which an embedded in neurilemma of Schwann cells, those of central nerves lie free in neuropil(nertwork of glial cells and nerve cell components).

So the correct option is B.

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

In a neuron, Schwann cells occur in associated with ____________.

  1. Axon

  2. Soma

  3. Dendrite

  4. Axon hillock
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Answer is option A i.e. "Axon"
Schwann cells cover the surface of all axons. Hence, Schwann cells are found in close contact with axons in the peripheral nerves. Schwann cells form the myelin sheath and are the main glial cells in the peripheral nervous system.
Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

In medullated nerve fibre, nodes of Ranvier represent areas ______________.

  1. Swellings on axon

  2. Myelin sheath touches axon

  3. Swelling on cyton

  4. Depressions found on cyton
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In medullated nerve fibers, the nodes of Ranvier are the specific points where the myelin sheath is interrupted and the axonal membrane comes into direct contact with the extracellular environment.