Biology

Nervous System and Neurons

1,224 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

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.

Multiple choice

Which of the following is NOT a type of pain?

  1. Nociceptive pain

  2. Neuropathic pain

  3. Psychogenic pain

  4. Phantom limb pain
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phantom limb pain is a type of neuropathic pain, not a separate category.

Multiple choice

The gate control theory of pain suggests that:

  1. Pain signals can be blocked by activating certain nerve fibers.

  2. Pain signals are always transmitted to the brain.

  3. Pain is purely a psychological phenomenon.

  4. Pain is always caused by tissue damage.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The gate control theory of pain suggests that pain signals can be blocked by activating certain nerve fibers, which close a 'gate' in the spinal cord.

Multiple choice

Which of the following is NOT a type of touch receptor?

  1. Tactile corpuscle

  2. Meissner's corpuscle

  3. Free nerve ending

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

Photoreceptors are responsible for detecting light, not touch.

Multiple choice

Which nerve is responsible for transmitting signals from the vestibular system to the brain?

  1. Vestibulocochlear nerve

  2. Auditory nerve

  3. Facial nerve

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

The vestibulocochlear nerve carries signals from the vestibular system and the auditory system to the brain.

Multiple choice

What is vestibular neuritis?

  1. An inflammation of the vestibular nerve

  2. A type of cancer that affects the inner ear

  3. A bacterial infection of the middle ear

  4. A condition that causes ringing in the ears
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vestibular neuritis is an inflammation of the vestibular nerve, which can cause sudden vertigo, nausea, and vomiting.

Multiple choice

What is the term for the process by which neurons communicate with each other?

  1. Synaptic Transmission

  2. Neurogenesis

  3. Long-Term Potentiation

  4. Axonal Transport
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Synaptic transmission is the process by which neurons communicate with each other. It involves the release of neurotransmitters from the presynaptic neuron, which bind to receptors on the postsynaptic neuron, triggering a response.