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

The receptors found in the muscles, tendons and joints are

  1. teloreceptors

  2. proprioreceptors

  3. interorereceptors

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

The receptors found in the muscles, tendons and joints are propriorecpetors. These are stretch recpetors. They supply information about the so called kinesthetic sense of equilibrium and orientation. They act like pressure gauges and are responsible for maintenance of body posture. 

Multiple choice

Damage to vagus nerve may lead to which of the following?

  1. Gastroparesis

  2. Gastroptosis

  3. Achlorhydria

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

A damaged vagus nerve cannot send signals to the stomach muscles. This may cause food to remain in the stomach longer, rather than move normally into the small intestine to be digested. This condition is called gastroparesis or paralysis of stomach.

Multiple choice

Match column I with column II.

 
Column I Column II
1. Autonomic nervous system i. Forebrain
2. Control centre of thinking ii. Brain and spinal cord
3. Central nervous system iii. Sympathetic and asympathetic nervous systems
4. Blood pressure is controlled by iv. Cerebellum
5. Activities like riding a bicycle are controlled by v. Medulla

  1. 1 - iii, 2 - i, 3 - ii, 4 - v, 5 - iv

  2. 1 - iv, 2 - iii, 3 - i, 4 - v, 5 - ii

  3. 1 - iii, 2 - i, 3 - v, 4 - ii, 5 - iv

  4. 1 - ii, 2 - iii, 3 - v, 4 - i, 5 - iv
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

2,4-D is a synthetic auxin, which is a class of plant hormones.

Multiple choice

The action potential in the nerve impulse results from

  1. decrease in -ve charge inside the nerve fibre

  2. increase in +ve charge outside the nerve fibre

  3. opening of voltage gated Na+ channels

  4. activation of Na-K pump
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Action potential is a short-lived fluctuation in membrane potential of the plasma membrane, which is caused by the opening of the voltage gated ion channels that actively moves the ions across the membrane causing the potential difference.

Multiple choice

What happens during reflex actions?

  1. Sensory impulses are converted into motor impulses in the brain.

  2. Sensory impulses are converted into motor impulses in the spinal cord.

  3. Motor impulses are converted to sensory impulses in the brain.

  4. Motor impulses are converted into sensory impulses in the spinal cord.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During reflex action, sensory impulses are converted into motor impulses in the spinal cord.

Multiple choice

Proprioceptors are found in

  1. skin

  2. eye

  3. muscles tendons and joints

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

Proprioceptors are found in muscle tendons and joints. These sense the movements and positions of muscles and appendages relative to each other and also to the spatial body as a whole.

Multiple choice

Which one is the correct representation of a reflex arc?

  1. Receptor - Sensory neuron - Motor neuron - Inter neuron - Effector organ

  2. Sensory neuron - receptor - Motor neuron - Inter neuron - Effector organ

  3. Receptor - Sensory neuron - Inter neuron - Motor neuron - Effector organ

  4. Receptor - Sensory neuron - Motor neuron
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Stimulus are received by receptors which passes it to sensory neuron that conveys impulses to spinal cord. Impulses are passed to motor neurons via inter-neurons and then, to the effector organ that responds to the impulses received.

Multiple choice

Which of the following statements is incorrect?

  1. Medulla secretes certain neurotransmitters.

  2. Adrenal medulla is a part of the nervous system.

  3. The medullary hormone bind to adregenic receptors.

  4. Adrenalin is known as tonus hormone.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Adrenalin is known as emergency hormone. Noradrenaline is the tonus hormone for the circulatory system.