Tag: nervous system of man

Questions Related to nervous system of man

Pneumotaxic centre which can moderate the function of respiratory rhythm centre is present at

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Pons

  2. Spinal cord

  3. Thalamus

  4. Right cerebral hemisphere

  5. Left cerebral hemisphere

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Correct Option: A

How many pairs of sympathetic ganglia are present in

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. 10

  2. 12

  3. 22

  4. 31

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Correct Option: C

Additional parasympathetic ganglia occur in

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Head and neck

  2. Lateral chains

  3. Spinal cord

  4. All the above

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Correct Option: A

An interneuron consists of the following

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Long dendrites and short axon

  2. Short dendrites and long and short axon

  3. Short dendrites and a long axon

  4. Long dendrites and a long axon

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Correct Option: B

Which of the following pairs correctly identifies function of parasympathetic nervous system?

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Slows heart beat, promotes pancreatic secretion

  2. Increases secretion of sweat gland and intestinal gland

  3. Accelerates heart beat, dilates arteries

  4. Raises blood pressure, increases peristaltic activity.

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Correct Option: A
Explanation:
Parasympathetic Nervous system: It is active during relaxing times, restoring normal activity after stress.
Sympathetic Nervous system: Active during stressful conditions, preparing the body to face them.
A. It is the function of parasympathetic nervous system.
B. Increase secretion of sweat gland by sympathetic nervous system and promote secretion of intestinal juice by parasympathetic nervous system.
C. Accelerates heart beat by sympathetic nervous system and dilates arteries by parasympathetic nervous system.
D. Raises blood pressure by sympathetic nervous system and increases peristaltic activity by parasympathetic nervous system.
So, the correct answer is 'Slows heart beat, promotes pancreatic secretion'.

Which of the following is not an effect produced by parasympathetic stimulation?

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Pupil dilation

  2. Increased saliva

  3. Increased stomach activity

  4. Constriction of bronchi

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Correct Option: A
Explanation:

Dilation of the pupil is the function of the sympathetic nervous system. Parasympathetic stimulation causes: slowing down of the heartbeat; lowering of blood pressure; constriction of the pupils; decreased heart rate; salivation increase; peristalsis of the GI tract.

Which one feature is correctly described?

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Salivary glands - secretes saliva - replication

  2. Pupil of the eyes - dilate - constricts- regulates entry of light

  3. Heart rate - decreases - tachycardia

  4. Intestinal peristalsis - stimulates - inhibits - heart rate

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Correct Option: B
Explanation:

The pupil is a hole or opening in the middle of the iris. Iris is the coloured part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil (contraction and dilation). Salivary glands are associated with digestion while intestinal peristalsis moves the food through the intestine. Tachycardia refers to the presence of faster heart beat. So, the correct answer is option B.

What are the sympathetic and parasympathetic nervous systems the part of?

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Brain

  2. Spinal cord

  3. Central nervous system

  4. Autonomous nervous system

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Correct Option: D
Explanation:

The sympathetic nervous system (SNS) is part of the autonomic nervous system (ANS), which also includes the parasympathetic nervous system (PNS).

So both sympathetic and parasympathetic nervous systems are the part of autonomous nervous system.
So the answer is 'Autonomous nervous system'. 

Parasympathetic nervous system on stimulation bring about the functions, like

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Dilation of blood vessels

  2. Contraction of pupil and muscles of urinary bladder

  3. Contraction of walls of digestive tract

  4. All of the above

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Correct Option: D
Explanation:

Parasympathetic stimulation causes: slowing down of the heartbeat; lowering of blood pressure; constriction of the pupils; increased blood flow to the skin and viscera; salivation increase; peristalsis of the GI tract.

The main functions of sympathetic nervous system are

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. The contraction of skin blood vessels and sudden increase of blood pressure

  2. Contraction of muscles, secretion of sweat glands and rapid coagulation of blood

  3. Dilation of bronchi, contraction of heart and sudden decrease in the number of RBC in the blood

  4. All of the above

Show answer
Correct Option: D
Explanation:

During the initial activation of the sympathetic system, norepinephrine gets released first as a preparatory hormone. This gets the body ready for the first stages of the emergency event. 

First, blood flow will increase to all essential tissues. This includes increased blood flow to the skeletal muscle, which will be needed to escape the situation and/or fight off the threat. 
Secondly, more oxygen will be needed to produce ATP (energy), so breathing rates will increase. 
Finally, glycogen, which is a storage form of glucose, will be broken down so that glucose molecules can be used for energy. These are the primary responses that will take place in the body when the sympathetic nervous system is activated.