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

Which among the following types of nervous system is associated with the phrases rest-and-digest and feed and breed qualities of the living organisms?

  1. Peripheral nervous system

  2. Central nervous system

  3. Autonomic nervous system

  4. Somatic nervous system

  5. Parasympathetic nervous system
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The parasympathetic system is responsible for stimulation of "rest-and-digest" or feed and breed activities that occur when the body is at rest, especially after eating, including sexual arousal, salivation, lacrimation (tears), urination, digestion and defecation.

Multiple choice

Which among the following is a mixed nerve?

  1. Sensory nerve

  2. Motor nerve

  3. Efferent nerves

  4. Cranial nerves

  5. Spinal nerve
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

A spinal nerve is a mixed nerve which carries motor, sensory and autonomic signals between the spinal cord and the body. There are 31 pairs of spinal nerves, one on each side of the human vertebral column.

Multiple choice

In a neuron, where are the ion channels located?

  1. Nodes of Ranvier

  2. Axoplasm

  3. Axon hillock

  4. Axon terminals

  5. Axolemma
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The axolemma is the cell membrane surrounding an axon. It is responsible for maintaining the membrane potential of the neuron, and it contains ion channels through which ions can flow.

Multiple choice

Which of the following statements is not correct?

  1. Optic nerve arising from the eye and ending in the brain is called mixed nerve.

  2. A nerve arising from brain and supplying blood to the muscles of the eyeball for rotating the eye is a motor nerve.

  3. The myelin sheath acts like an insulation.

  4. A wave of irritability is called an impulse.

  5. Acetylcholine sets a new impulse in the dendrites of the adjacent neuron.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Optic nerve arising from the eye and ending in the brain is a sensory nerve.

Multiple choice

Which of the following statements is incorrect about nerve impulse?

  1. In normal condition, the outer side of the nerve fibre carries positive charge.

  2. The condition when outer side of nerve fibre carries normal (+) charge is called depolarized state.

  3. Nerve impulse travels at a maximum speed of about 100 metres per second only.

  4. Repolarization of nerve takes place due to active transport of Na+ ions again to the outside.

  5. Conduction of nerve impulse is a wave of depolarization followed by repolarisation.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The condition when outer side of nerve fibre carries normal positive charge is called polarized state.

Multiple choice

Suppose the terminal ends of axon are in contact with dendrites of four adjacent neurons, the nerve impulse of the axon will

  1. travel in one of the neurons because the impulse travels from dendrites of one neuron into the axon of another neuron

  2. travel only in one neuron, which is in closest contact and with the same intensity

  3. get distributed in all the four neurons resulting in weak impulse

  4. travel in all the four neurons

  5. travel in only two neurons, which are most closely associated
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The nerve impulse will travel in all the four neurons.

Multiple choice

Which of the following is true about association neurons?

  1. They convey the impulse from receptor to the brain.

  2. They carry impulse from the main nervous system to an effector.

  3. They interconnect the sensory and motor neurons.

  4. They conduct depolarization impulse.

  5. They convey the impulse from receptor to an effector.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Association neurons are located in the brain and spinal cord, which interconnect the sensory and motor neurons.