Biology

Nervous System and Neurons

1,164 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

Which of the following is NOT a type of pain?

  1. Nociceptive Pain

  2. Neuropathic Pain

  3. Psychogenic Pain

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

Psychogenic pain is not a recognized type of pain in the field of medicine.

Multiple choice

Which type of glial cell is responsible for producing myelin sheaths in the central nervous system?

  1. Astrocytes

  2. Oligodendrocytes

  3. Microglia

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

Oligodendrocytes are responsible for producing myelin sheaths around axons in the central nervous system, which insulates the axons and increases the speed of nerve impulses.

Multiple choice

Which type of glial cell is responsible for producing myelin sheaths in the peripheral nervous system?

  1. Astrocytes

  2. Oligodendrocytes

  3. Microglia

  4. Schwann Cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Schwann cells are responsible for producing myelin sheaths around axons in the peripheral nervous system, which insulates the axons and increases the speed of nerve impulses.

Multiple choice

What is the role of radial glial cells during development?

  1. Provide structural support to neurons

  2. Regulate the chemical environment of neurons

  3. Produce myelin sheaths

  4. Generate new neurons and glial cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Radial glial cells are neural stem cells that play a crucial role in the development of the central nervous system, generating new neurons and glial cells through a process called neurogenesis and gliogenesis.

Multiple choice

What is the role of ependymal cells?

  1. Provide structural support to neurons

  2. Regulate the chemical environment of neurons

  3. Produce myelin sheaths

  4. Line the ventricles and central canal of the spinal cord
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ependymal cells line the ventricles of the brain and the central canal of the spinal cord, forming a protective barrier and regulating the flow of cerebrospinal fluid.

Multiple choice

Which type of glial cell is involved in the formation of the optic nerve?

  1. Astrocytes

  2. Oligodendrocytes

  3. Microglia

  4. Müller Cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Müller cells, a type of glial cell found in the retina, play a crucial role in the formation of the optic nerve by guiding the axons of retinal ganglion cells towards the optic disc.

Multiple choice

What is the function of Schwann cells in the peripheral nervous system?

  1. Provide structural support to neurons

  2. Regulate the chemical environment of neurons

  3. Produce myelin sheaths

  4. Phagocytize cellular debris
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Schwann cells are responsible for producing myelin sheaths around axons in the peripheral nervous system, which insulates the axons and increases the speed of nerve impulses.

Multiple choice

Which of the following is NOT a component of a neuron?

  1. Dendrites

  2. Axon

  3. Cell body

  4. Synapse
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Synapses are the junctions between neurons where signals are transmitted.

Multiple choice

What is the role of the axon hillock?

  1. Generating electrical impulses

  2. Transmitting signals to other neurons

  3. Receiving signals from other neurons

  4. Storing memories
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The axon hillock is the region of the neuron where electrical impulses are generated.

Multiple choice

What is the structure responsible for converting sound vibrations into electrical signals?

  1. Basilar membrane

  2. Organ of Corti

  3. Cochlea

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

The organ of Corti, located within the cochlea, contains hair cells that convert sound vibrations into electrical signals.

Multiple choice

The Polyvagal Theory, proposed by Stephen Porges, focuses on the role of the:

  1. Sympathetic nervous system

  2. Parasympathetic nervous system

  3. Central nervous system

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

The Polyvagal Theory emphasizes the role of the parasympathetic nervous system, particularly the vagus nerve, in regulating emotional responses and social engagement.

Multiple choice

Which of the following is NOT a type of mechanoreceptor?

  1. Tactile corpuscle

  2. Meissner's corpuscle

  3. Free nerve ending

  4. Thermoreceptor
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thermoreceptors are responsible for detecting temperature, not mechanical stimuli.

Multiple choice

The sense of touch is primarily mediated by which cranial nerve?

  1. Trigeminal nerve

  2. Facial nerve

  3. Glossopharyngeal nerve

  4. Vagus nerve
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The trigeminal nerve is responsible for sensation in the face, including the sense of touch.

Multiple choice

Which of the following is NOT a function of the somatosensory system?

  1. Detecting pain

  2. Detecting temperature

  3. Detecting proprioception

  4. Detecting visual stimuli
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The somatosensory system is responsible for detecting touch, pain, temperature, and proprioception, but not visual stimuli.

Multiple choice

Which of the following is NOT a type of thermoreceptor?

  1. Free nerve ending

  2. Ruffini corpuscle

  3. Krause end bulb

  4. Meissner's corpuscle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Meissner's corpuscle is a mechanoreceptor, not a thermoreceptor.