Competitive Exams: Medical Science MCQs (Practice-Test 24 of 135)

  1. Excessive polarization due to GABA is created due to the opening of ____ channels.

    1. Ca + +

    2. Cl-

    3. K +

    4. Na +

    Answer: b

  2. Valium has an effect on ____ to inhibit neural transmission.

    1. Epinephrine

    2. Norepinephrine

    3. GABA

    4. Dopamine

    Answer: c

  3. The drug ____ blocks the reuptake of serotonin into presynaptic axons.

    1. Prozac

    2. Valium

    3. Xanax

    4. Deprenyl

    Answer: a

  4. Which of the following toxins blocks Sodium Channels?

    1. Srychnine

    2. Neostigmine

    3. Tetrodotoxin

    4. Curare

    Answer: c

  5. Clostridium botulinum releases this enzyme that destroys peptide bonds.

    1. Amylase

    2. Endopeptidases

    3. Exopeptidases

    4. Protein kinase

    Answer: b

  6. Multiple sclerosis is a disease that attacks the _______ of neurons in the CNS.

    1. Myelin sheaths

    2. Axon terminals

    3. Sodium channels

    4. Nicotinic receptors

    Answer: a

  7. Which of the following is not considered a type of synapse?

    1. Dendrodendritic

    2. Axosomatic

    3. Axoaxonic

    4. Denoaxonic

    Answer: d

  8. The progression of a nerve impulse with the nodes of Ranvier is called _______.

    1. Saltatory conduction

    2. Transmission

    3. Unmyelinated conduction

    4. Relative conduction

    Answer: a

  9. Supporting cells located within the CNS are collectively called _____.

    1. Neuroglia

    2. Astrocytes

    3. Perikaryon

    4. Satellite cells

    Answer: a

  10. Which of the following types of cells line the ventricles and spinal cord?

    1. Astrocytes

    2. Schwann cells

    3. Ependymal cells

    4. Oligodendrocytes

    Answer: c