Nervous system mcqs | Biology most repeated mcqs | Biology mcqs | zoology mcqs

 1. Integrative systems in our body are which of he following:

A.NervousB.Endocrine system

C.Both (a) & (b)D.None of these

Answer & Explanation

Answer: Option C

Explanation:

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2. Nervous system in organisms, in general, serve to:

A.Regulate and control the activities of different organs in the bodyB.Link and coordinate the activities of various organs to ensure the integrity of the animal

C.Help the organs to maintain unity with the environmentD.All of these functions

Answer & Explanation

Answer: Option D

Explanation:

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3. Functionally neurons may be:

A.Afferent that carry impulses from periphery of the body to CNSB.Efferent that carry impulses from CNS to the effector organs

C.Both (a) & (b)D.None of these

Answer & Explanation

Answer: Option C

Explanation:

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4. Between afferent and afferent neurons are found:

A.Internuncial neuronsB.Neuromuscular junctions

C.SynapsesD.None of these

Answer & Explanation

Answer: Option A

Explanation:

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5. Routing of signals to one of several alternative circuits, amplification of certain signals while reduction of others, integration of signals from diffuse sources, learning etc, are performed by:

A.Inter-neuronsB.Synapses

C.Neuromuscular junctionsD.None of these

Answer & Explanation

Answer: Option B

Explanation:

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6. The distal ends of which of these neurons lie adjacent to blood stream:

A.Afferent neuronsB.Efferent neurons

C.Inter-neuronsD.Neurosecretory neurons

Answer & Explanation

Answer: Option D

Explanation:

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7. Which of these neurons secrete neurohormones:

A.AfferentB.Efferent

C.InternununcialD.Neurosecretory

Answer & Explanation

Answer: Option D

Explanation:

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8. Functional junction between dendritic region of one reuron or nerve axon ending of other neuron is termed:

A.SynapseB.End plate

C.Neuromuscular junctionD.None of these

Answer & Explanation

Answer: Option A

Explanation:

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9. Term synapse was applied by:

A.Sir Charles SherringtonB.Charles Darwin

C.MclenanD.None of these

Answer & Explanation

Answer: Option A

Explanation:

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10. Who established the physiological importance of synapses:

A.MclenanB.Sherrington

C.DarwinD.None of these

Answer & Explanation

Answer: Option A

11. Which of these have excitability:

A.NeuronsB.Muscle fibres

C.Both (a) & (b)D.None of these

Answer & Explanation

Answer: Option C

Explanation:

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12. Which of these is a correct statement:

A.All of the neurons are excitableB.All of the neurons can transmit impulses across their membrane

C.Transmission of nerve impulses is always unidirectionalD.All of these statements

Answer & Explanation

Answer: Option D

Explanation:

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13. The impulses from sense organs are always carried from sense organs to CNS by means of:

A.DendritesB.Axons

C.CytonsD.None of these

Answer & Explanation

Answer: Option A

Explanation:

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14. Impulses from CNS to effectors are always carried by:

A.DendritesB.Axons

C.CytonsD.All of these

Answer & Explanation

Answer: Option B

Explanation:

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15. Maximum length of a nerve fibre can be:

A.1 metreB.5 metre

C.7 metreD.10 metre

Answer & Explanation

Answer: Option D

Explanation:

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16. Conduction of nerve impulse through a nerve fibre is purely:

A.A physical phenomenonB.A mechanical phenomenon

C.An electrochemical phenomenonD.None of these

Answer & Explanation

Answer: Option C

Explanation:

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17. A nerve fibre can transmit impulses at the rate of:

A.5 metre per secondB.10 metre per second

C.100 metre per secondD.130 metre per second

Answer & Explanation

Answer: Option D

Explanation:

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18. An impulse travels along the nerve fibre as a :

A.Self propagative wave of some electrochemical changesB.Self propagative wave of mechanical changes

C.Self-propagative wave of thermal changesD.Self propagative wave of none of these changes

Answer & Explanation

Answer: Option A

Explanation:

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19. Conduction of nerve impulse depends upon:

A.Permeability of axolemmaB.Osmotic equilibrium

C.Electrical equivalence between axoplasm and ECFD.All of these

Answer & Explanation

Answer: Option D

Explanation:

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20. Under the condition of disturbed permeability of axolemma the nerve impulse will:

A.Conduct normallyB.Conduct abnormally

C.Conduct slowlyD.Conduct first slowly then fastly

Answer & Explanation

Answer: Option B

Explanation:

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21. Under the condition of disturbed electrical equivalence between axoplasm and ECF the conduction of nerve impulse will be:

A.NormalB.Abnormal

C.UnaffectedD.None of these

Answer & Explanation

Answer: Option B

Explanation:

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22. Longest cell in our body may be:

A.Muscle cellB.Nerve cell

C.Uriniferous tubuleD.None of these

Answer & Explanation

Answer: Option B

Explanation:

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23. How can we disturb the conduction of impulse through a nerve fibre:

A.By disturbing the permeability of axolemmaB.By altering the osmotic equilibrium

C.By disturbing the electrical equivalenceD.By all of these processes

Answer & Explanation

Answer: Option D

Explanation:

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24. Synapse is a gap between adjacent:

A.Nerve cellsB.Muscle cells

C.Muscle fibresD.Nerve cell and other cell

Answer & Explanation

Answer: Option A

Explanation:

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25. An impulse will travel through a nerve fibre only if the membrane becomes more permeable to ions of:

A.ChlorideB.Potassium

C.CalciumD.Sodium

Answer & Explanation

Answer: Option D

Explanation:

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26. Nerve impulse is in fact, a process which is associated with which of these phenomenon:

A.ElectricalB.Chemical

C.ElectrochemicalD.Physical

Answer & Explanation

Answer: Option C

Explanation:

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27. A nerve which conducts impulses from a tissue to nerve is called:

A.AfferentB.Efferent

C.MotorD.Mixed

Answer & Explanation

Answer: Option A

Explanation:

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28. Afferent nerve fibres conduct impulses from:

A.Effectors to receptorsB.Receptors to effectors

C.Receptors to CNSD.CNS to receptors

Answer & Explanation

Answer: Option C

Explanation:

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29. During conduction of an impulse, electric potential on inside of axolemma changes from:

A.Negative to positive and remain positiveB.Negative to positive and remain negative

C.Positive to negative and remain positiveD.Positive to positive and remain negative

Answer & Explanation

Answer: Option C

Explanation:

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30. In animals with closed circulation the ECF has which of these compartments:

A.Interstitum or tissue fluidB.Circulating fluid (blood or plasma)

C.Both (a) & (b)D.None of these

Answer & Explanation

Answer: Option C

Explanation:

31. ECF contains which of these in large amounts:

A.Sodium chloride or bicarbonatesB.Magnesium and potassium phosphates

C.Both of these substances listed in (a) & (b)D.None of these

Answer & Explanation

Answer: Option C

Explanation:

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32. In the resting stage the axolemma is:

A.Poorly permeable to Na+B.Quite permeable to K+ and Cl-

C.Impermeable to all theseD.Both (a) & (b)

Answer & Explanation

Answer: Option D

Explanation:

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33. In resting stage the axolemma is poorly permeable to Na+ but quite permeable to K+ and Cl- by:

A.10-20 timesB.20-30 times

C.50-60 timesD.50-100 times

Answer & Explanation

Answer: Option D

Explanation:

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34. Concentration of Na+ and Cl- into ECF is:

A.10 times more than in cytoplasmB.20 times more than in cytoplasm

C.10-14 times more than in CytoplasmD.40 times more than n cytoplasm

Answer & Explanation

Answer: Option C

Explanation:

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35. Concentration of K+ in cytoplasm is about:

A.10 time more than in ECFB.20 times more than in ECF

C.30 times more than in ECFD.40 time more than in ECF

Answer & Explanation

Answer: Option C

Explanation:

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36. To avoid the danger of osmotic equilibrium due to passive transport of Na+ and Cl- from into cytoplasm from ECF and that of K+ from cytoplasm into ECF, all the cells:

A.Constantly expel Na+ into ECF and take K+ from cytoplasm against concentration gradientB.All cells do not expel Na+ into ECF and take K+ from cytoplasm

C.All cells expel K+ into ECF and take Na+ from cytoplasmD.All cells expel Cl- into ECF and take HCO-3

Answer & Explanation

Answer: Option A

Explanation:

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37. Sodium pump means:

A.Expelling of Na+ into ECF and intake of K+ from cytoplasm against concentration gradientB.Expelling of K+ into ECF and intake of Na+ from cytoplasm

C.Only expelling of Na+ into ECFD.Only intake of K+ into cytoplasm

Answer & Explanation

Answer: Option A

Explanation:

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38. Sodium-potassium-pump operates with the help of which of these enzymes:

A.Na+ - K+ ATPaseB.Phosphatase

C.IsomeraseD.Hydrolase

Answer & Explanation

Answer: Option A

Explanation:

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39. The negative charges over complex organic molecules are neutralized by:

A.Potassium ionsB.Sodium ions

C.Chloride ionsD.None of these

Answer & Explanation

Answer: Option A

Explanation:

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40. Neutralization of negative charges over complex organic molecules by K+ ions is a necessary process:

A.To protect the coagulation of cytoplasm which could occur due to electric potential established within the cytoplasmB.To protect dehydration of neurons

C.To protect hydration of axoplasm of neuronD.To neutralize the surface charge over axon

Answer & Explanation

Answer: Option A

Explanation:

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41. Sodium-pump functions mainly to:

A.Maintain osmotic equilibrium between ECF and cytoplasmB.Reduce the charges over surface membrane

C.To speed up the propagation of nerve impulseD.Perform none of these

Answer & Explanation

Answer: Option A

Explanation:

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42. Maintenance of osmotic equilibrium between ECF and cytoplasm with the help of sodium - pump leaves every cell with a net difference of which of these between its cytoplasm and ECF

A.12 mEqB.22 mEq

C.32 mEqD.42 mEq

Answer & Explanation

Answer: Option D

Explanation:

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43. Each cell in resting stage is in polarized state with a membrane potential of:

A.?50mVB.?60 mV

C.?70 mVD.80 mV

Answer & Explanation

Answer: Option C

Explanation:

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44. The electric potential across membrane of each resting cell is:

A.Resting potentialB.Action potential

C.Membrane potentialD.None of these

Answer & Explanation

Answer: Option A

Explanation:

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45. The action potential on inner side of axolemma is:

A.45 mVB.55 mV

C.65 mVD.75 mV

Answer & Explanation

Answer: Option A

Explanation:

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46. At the point of stimulation the depolarization is of axolemma brought about by:

A.Increased permeability for sodium ions resulting in influx of Na+ from ECF into cytoplasmB.Decreased permeability for sodium ions resulting in outflux of these from cytoplasm into ECF

C.Influx of K+ ions from ECF into cytoplasmD.None of these processes

Answer & Explanation

Answer: Option A

Explanation:

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47. Saltatory transmission of nerve impulse occurs in the:

A.Myelinated neuronsB.Non-myelinated neurons

C.Both of these neuronsD.None of these neurons

Answer & Explanation

Answer: Option A

Explanation:

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48. In saltatory transmission the impulse propagates:

A.Throughout the fibre in linear fashionB.From one node of Ranvier to other and so on so forth

C.Without passing through synapsesD.In none of these ways

Answer & Explanation

Answer: Option B

Explanation:

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49. Transmission in myelinated fibres occurs:

A.At about 50 times faster rate than non-myelinated onesB.At about 50 times slower rate than non-myelinated ones

C.At the same rate as in the non-myelinated onesD.At about 100 times slower rate than non-myelinated ones

Answer & Explanation

Answer: Option A

Explanation:

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50. Transmission through synapses is:

A.Very short lived and occurs only for 0.5 millisecondsB.Long lived and occurs of 1.0 milli-seconds

C.Both long lived and short livedD.Of some other type

Answer & Explanation

Answer: Option A

Explanation: