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Neural Control and Coordination · Question 49

AIPMT 2005MCQEasy📈 Topic in 0% papers+4−1
1

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

Answer

(1) Movement of the eyeball

Solution

The abducens nerve is the VI cranial nerve. It is a motor nerve that supplies the lateral rectus muscle of the eye.

⇒ The lateral rectus turns (abducts) the eyeball outwards.

Tongue movement is controlled by the hypoglossal (XII) nerve, swallowing mainly by the glossopharyngeal (IX) and vagus (X) nerves, and neck movement by the accessory (XI) nerve.

∴ Injury to the abducens nerve affects movement of the eyeball.

Answer: (1)

AIPMT 2005

Keep practising — Neural Control and Coordination

2

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
3

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
4

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
5

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
6

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
7

Which of the following statements is correct for node of Ranvier of nerve?

  1. Neurilemma is discontinuous
  2. Myelin sheath is discontinuous
  3. Both neurilemma and myelin sheath are discontinuous
  4. Covered by myelin sheath
AIPMT 2002
8

When we migrate from dark to light, we fail to see for some time but after a time visibility becomes normal. It is an example of

  1. accommodation
  2. adaptation
  3. mutation
  4. photoperiodism
Out of syllabusAIPMT 2001
9

Which of the following statements is the characteristic of human cornea?

  1. It is secreted by conjunctiva and glandular layer.
  2. It is a lacrimal gland which secretes tears.
  3. Blood circulation is absent in cornea.
  4. In old age it becomes the cause of cataract.
Out of syllabusAIPMT 2001
10

Depolarization of axolemma during nerve conduction takes place because of

  1. equal amount of Na+ and K+ move out across axolemma
  2. Na+ move inside and K+ move more outside
  3. more Na+ outside
  4. none of these
AIPMT 2000
11

Which food should be eaten during deficiency of rhodopsin in eyes?

  1. Carrot and ripe papayas
  2. Guava, banana
  3. Mango and potato
  4. None of the above
Out of syllabusAIPMT 2000

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