Tag: the human brain

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

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

  1. Pupil dilation

  2. Increased saliva

  3. Increased stomach activity

  4. Constriction of bronchi
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which one feature is correctly described?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Brain

  2. Spinal cord

  3. Central nervous system

  4. Autonomous nervous system
Reveal answer Fill a bubble to check yourself
D Correct answer
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'. 

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

Parasympathetic nervous system on stimulation bring about the functions, like

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The main functions of sympathetic nervous system are

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Parasympathetic nervous system has its origin from

  1. The brain

  2. The spinal cord

  3. Both of the above

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Parasympathetic nerve fibres arise from the central nervous system with the $S _2$, $S _3$, and $S _4$ spinal nerves and from the third, seventh, ninth, and tenth cranial nerves. 

Because of its location, the parasympathetic system is commonly referred to as having craniosacral outflow.

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

Which one of the following is not an effect of sympathetic nervous system? 

  1. Dilation of pupil

  2. Inhibition of peristalsis

  3. Elevation of blood pressure

  4. Stimulation for saliva secretion during digestion or eating
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sympathetic nervous system is involved in the stimulation of activities that prepare the body for action, such as increasing the heart rate, increasing the release of sugar from the liver into the blood, and other generally considered as fight-or-flight responses (responses that serve to fight off or retreat from danger). 

The parasympathetic nervous system activates tranquil functions, such as stimulating the secretion of saliva or digestive enzymes into the stomach.

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

Sympathetic fibres are generally stimulatory except that they

  1. Inhibit the contraction of urinary bladder

  2. Inhibit peristalsis

  3. Inhibit the secretion of saliva

  4. Inhibit the rate of heart beat

  5. Both B and C
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The autonomic nervous system is made up of sympathetic nervous system and para-sympathetic nervous system. The sympathetic nervous system made up of sympathetic fibers is responsible for the body's flight or fight response The sympathetic nerves or fibers increases heart rate and helps enhancing the blood flow, while inhibiting digestion and peristalsis.

So, the correct answer is 'Both B and C'

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

A ramus communicans consists of

  1. White ramus only

  2. Grey ramus only

  3. Both A and B

  4. Red ramus only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ramus communicans is the branch which connects the spinal nerve and the sympathetic trunk.  There are two forms of ramus communicans. They are gray ramus communicans and white ramus communicans. They are responsible for conduction of signals in the sympathetic nervous system. The white rami communicans are the preganglionic sympathetic outflow from the spinal cord. The gray rami communicans contain postganglionic nerve fibers of the sympathetic nervous system and are composed of largely unmyelinated neurons.

So, the correct answer is option C.