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 nervous system controls involuntary body functions?

  1. autonomic nervous system

  2. central nervous system

  3. cerebro-spinal system

  4. enteric system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The autonomic nervous system regulates involuntary physiological processes such as heart rate, digestion, and respiratory rate. Other options like the central nervous system are involved in processing information and controlling voluntary actions.

Multiple choice

Which nervous system controls voluntary activity?

  1. central nervous system

  2. cerebro-spinal system

  3. autonomic nervous system

  4. both a & b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The somatic nervous system is typically responsible for voluntary movement. However, in many electrology curricula, the cerebro-spinal system (which includes the brain and spinal cord) is taught as the primary controller of voluntary activity. Given the options provided, D is the intended answer.

Multiple choice

What is the technical name for sensory nerves?

  1. afferent nerves

  2. efferent nerves

  3. eccrine nerves

  4. apocrine nerves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Afferent nerves, also known as sensory nerves, carry impulses from sensory receptors toward the central nervous system. Efferent nerves are motor nerves that carry impulses away from the central nervous system.

Multiple choice

Which nervous system controls voluntary actions?

  1. sympathetic system

  2. autonomic system

  3. parasympathetic system

  4. cerebro-spinal system
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The cerebro-spinal (or somatic) nervous system controls voluntary actions, such as moving muscles. The autonomic system controls involuntary functions like heart rate and digestion.

Multiple choice

The spinal cord and brain are part of which nervous system?

  1. central nervous system

  2. autonomic nervous system

  3. peripheral nervous system

  4. sympathetic nervous system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The central nervous system (CNS) consists of the brain and the spinal cord. The peripheral nervous system consists of the nerves branching out from the CNS.

Multiple choice

What do you call the sensory nerve that detects heat?

  1. meissner

  2. ruffini

  3. krause

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

Ruffini corpuscles are sensory receptors in the skin that are primarily responsible for detecting heat. Meissner's detect touch, Krause's detect cold, and Pacinian detect pressure.

Multiple choice

What do you call the sensory nerves that detect “touch”?

  1. ruffini

  2. meissner

  3. krause

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

Meissner corpuscles are specialized sensory nerve endings in the skin that are highly sensitive to light touch and low-frequency vibration. Other options like Pacinian corpuscles detect deep pressure, while Ruffini and Krause endings detect stretch and cold respectively.

Multiple choice

Extreme stimulation of sensory nerves causes what?

  1. redness

  2. twitching

  3. pain

  4. sensation of comfort
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sensory nerves transmit signals to the brain; when these nerves are subjected to extreme stimulation, the brain interprets the signal as pain.

Multiple choice

What does the nervous system control?

  1. the brain

  2. pain

  3. some body functions

  4. all body functions
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The nervous system is the body's command center, regulating and controlling all bodily functions, including voluntary movements and involuntary processes.

Multiple choice zoology nervous system of man pns divisions of nervous system peripheral nervous system

Smallest cranial nerve in humans is

  1. Optic

  2. Olfactory

  3. Oculomotor

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

The trochlear nerve (cranial nerve IV), historically known as the pathetic nerve, is the smallest cranial nerve in terms of the number of axons it contains and its slender appearance. It supplies the superior oblique muscle of the eye. Olfactory (I) and optic (II) are larger sensory nerves, while oculomotor (III) is much thicker.

Multiple choice zoology nervous system of man pns divisions of nervous system peripheral nervous system

II, VII, VIII and IX cranial nerves are

  1. Optic, facial, auditory, glossopharyngeal

  2. Optic, auditory, facial, hypoglossal

  3. Oculomotor, auditory, abducens, hypoglossal

  4. Optic, facial, abducens and gloss-opharyngeal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cranial nerve II is the Optic nerve, VII is the Facial nerve, VIII is the Vestibulocochlear (auditory) nerve, and IX is the Glossopharyngeal nerve.