Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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.

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

Which pair of structures distinguishes a nerve cell from other cells?

  1. Vacuole and fibres

  2. Nucleus and mitochondria

  3. Perikaryon and dendrites

  4. Flagellum and medullary sheath
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The perikaryon (cell body) and dendrites are characteristic structures of a neuron that distinguish it from other typical animal cells. While other cells have nuclei and mitochondria, these specific extensions and the cell body structure are unique to neurons.