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Neural Control and Coordination · Question 44

AIPMT 2007MCQEasy📈 Topic in 0% papers+4−1
1

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

Answer

(4) First negative, then positive and again back to negative

Solution

As per NCERT, at rest the inner side of the axonal membrane is negatively charged (resting potential).

On stimulation, Na+ rush in ⇒ the inner side becomes positive (depolarisation, action potential).

Then K+ diffuse out ⇒ the inner side becomes negative again (repolarisation).

∴ The change is first negative, then positive and again back to negative.

Answer: (4)

AIPMT 2007

Keep practising — Neural Control and Coordination

2

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
3

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
4

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

  1. Cortisone
  2. Acetylcholine
  3. Epinephrine
  4. Norepinephrine
AIPMT 2006
5

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
6

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
7

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
8

Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cells of the following. Which of the cells are least likely to be replaced by new cells -

  1. Malpighian layer of the skin
  2. Osteocytes
  3. Neurons
  4. Liver cells
AIPMT 2005
9

In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive

  1. K+ into the cell
  2. K+ and Na+ out of the cell
  3. Na+ into the cell
  4. Na+ out of the cell.
AIPMT 2004
10

Injury to vagus nerve in humans is not likely to affect

  1. tongue movements
  2. gastrointestinal movements
  3. pancreatic secretion
  4. cardiac movements.
AIPMT 2004
11

What used to be described as Nissl's granules in a nerve cell are now identified as

  1. cell metabolites
  2. fat granules
  3. ribosomes
  4. mitochondria.
AIPMT 2003

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