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Neural Control and Coordination · Question 40

AIPMT 2008MCQEasy📈 Topic in 0% papers+4−1
1

During the propagation of a nerve impulse, the action potential results from the movement of

  1. K+ ions from intracellular fluid to extracellular fluid
  2. Na+ ions from extracellular fluid to intracellular fluid
  3. K+ ions from extracellular fluid to intracellular fluid
  4. Na+ ions from intracellular fluid to extracellular fluid

Answer

(2) Na+ ions from extracellular fluid to intracellular fluid

Solution

As per NCERT, when a stimulus is applied, the membrane at that site becomes freely permeable to Na+.

⇒ This leads to a rapid influx of Na+ from the extracellular fluid into the axon (intracellular fluid).

⇒ The polarity at that site reverses (inside positive, outside negative): this depolarised state is the action potential, i.e., the nerve impulse.

∵ Outflow of K+ occurs later and restores the resting potential (repolarisation).

Answer: (2)

AIPMT 2008

Keep practising — Neural Control and Coordination

2

Given below is a diagrammatic cross section of a single loop of human cochlea. [Figure] Which one of the following options correctly represents the names of three different parts?

  1. B : Tectorial membrane, C : Perilymph, D : Secretory cells
  2. A : Perilymph, B : Tectorial membrane, C : Endolymph
  3. C : Endolymph, D : Sensory hair cells, A : Serum
  4. D : Sensory hair cells, A : Endolymph, B : Tectorial membrane
AIPMT 2008
3

Cornea transplant in humans is almost never rejected. This is because

  1. it is composed of enucleated cells
  2. it is a non-living layer
  3. its cells are least penetrable by bacteria
  4. it has no blood supply
Out of syllabusAIPMT 2008
4

Which one of the following is the correct difference between rod cells and cone cells of our retina?

  1. array|l|l|l| & Rod cells & Cone cells \ Overall function & Vision in poor light & Colour vision and detailed vision in bright light \ array
  2. array|l|l|l| & Rod cells & Cone cells \ Distribution & More concentrated in centre of retina & Evenly distributed all over retina \ array
  3. array|l|l|l| & Rod cells & Cone cells \ Visual acuity & High & Low \ array
  4. array|l|l|l| & Rod cells & Cone cells \ Visual pigment contained & Iodopsin & Rhodopsin \ array
Out of syllabusAIPMT 2008
5

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change?

  1. First positive, then negative and continue to be negative
  2. First negative, then positive and continue to be positive
  3. First positive, then negative and again back to positive
  4. First negative, then positive and again back to negative
AIPMT 2007
6

Bowman's glands are located in the

  1. Anterior pituitary
  2. Female reproductive system of cockroach
  3. Olfactory epithelium of our nose
  4. Proximal end of uriniferous tubules
AIPMT 2007
7

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

  1. Perikaryon and dendrites
  2. Nucleus and mitochondria
  3. Flagellum and medullary sheath
  4. Vacuoles and fibres
AIPMT 2007
8

Which one of the following does not act as a neurotransmitter?

  1. Cortisone
  2. Acetylcholine
  3. Epinephrine
  4. Norepinephrine
AIPMT 2006
9

Which one of the following is an example of the action of the autonomic nervous system?

  1. Swallowing of food
  2. Pupillary reflex
  3. Peristalsis of the intestine
  4. Knee-jerk response
AIPMT 2005
10

In a man, abducens nerve is injured. Which one of the following functions will be affected?

  1. Movement of the eyeball
  2. Movement of the tongue
  3. Swallowing
  4. Movement of the neck
AIPMT 2005
11

Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter

  1. acetylcholine
  2. norepinephrine
  3. dopamine
  4. GABA
AIPMT 2005

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