Competitive Exams: Medical Science MCQs (Practice-Test 86 of 135)

  1. Which one of the following statements regarding parotid gland is not correct?

    1. It is mainly a serous gland.

    2. Mucous acini are rare.

    3. It has myoepithelial cells.

    4. Intercalated ducts are absent.

  2. The branches of the following arteries supply the spinal cord except:

    1. Vertebral

    2. Superficial cervical

    3. Intercostal

    4. Lumbar

  3. What is the number of days in which the generation of a mature spermatozoon from a spermatogonium occurs?

    1. 16

    2. 32

    3. 48

    4. 64

  4. Consider the following statements: The melanocytes present in the skin

    1. have dendritic processes.

    2. are multinucleated cells.

    3. are present in the epidermis.

    4. are mesodermal in origin.

    Which of the statements given above are correct?

    1. 1 and 2

    2. 1 and 3

    3. 2, 3 and 4

    4. 2 and 4 only

  5. Parkinsons disease is caused by the degeneration of which one of the following biochemically distinct neural pathways?

    1. Nigrostriatal adrenergic

    2. Nigrostriatal dopaminergic

    3. Intrastriatal cholinergic

    4. Intrastriatal gabaergic

  6. Consider the following statements: The function/functions of Sertoli cells present in the seminiferous tubules is/are to

    1. secrete androgen binding protein (ABP) and inhibin

    2. secrete MIS to inhibit Mullerian duct system

    3. convert androgen to estrogen

    4. form blood-testicular-barrier to protect sperms

    Which of the statements given above is/are correct?

    1. 1 and 2 only

    2. 2 and 3 only

    3. 1, 2, 3 and 4

    4. 4 only

  7. The firing rate of Ia fibres on reducing the stretch on muscle spindle

    1. Bears no correlation

    2. Decreases

    3. Increases

    4. Decreases after an initial increase

  8. Consider the following events in the generation of receptor potential in rods when the light stimulates it:

    1. Activation of transducin

    2. Activation of rhodopsin

    3. Closure of Na + channels

    4. Hyperpolarization

    What is the correct sequence of the above events?

    1. 1 − 3 − 2 − 4

    2. 2 − 1 − 3 − 4

    3. 1 − 2 − 3 − 4

    4. 2 − 3 − 1 − 4

  9. Consider the following:

    1. Sinoatrial node

    2. Atrioventricular node

    3. Base of the heart

    4. Apex of the heart

    Regarding the above, what is the correct sequence in which cardiac impulse spreads in a normal healthy individual?

    1. 1, 2, 4, 3, 5

    2. 1, 4, 2, 5, 3

    3. 1, 2, 4, 5, 3

    4. 1, 2, 3, 4, 5

  10. Which one of the following shows a prominent prepotential?

    1. Sinoatrail node

    2. Atrail muscle cells

    3. Purkinjes system

    4. Ventricular muscle cells

  11. The following are observed after parasympathetic stimulation except:

    1. Depression of ventricular myocardium

    2. Inhibition of adenylyl cyclase through nicotine receptors

    3. Inhibition of norepinephrine release

    4. Decrease in the peak left ventricular pressure

  12. The times vital capacity, FEV1 is used to evaluate the:

    1. Compliance of the lung

    2. Pulmonary blood flow resistance

    3. Flow-resistance properties of lung

    4. Elastic properties of lung

  13. Consider the following statements: The symports in the luminal surface of the epithelial cells of the proximal tubule are involved in the reabsorption of:

    1. sodium ions and glucose

    2. sodium and hydrogen ions

    3. water

    4. Sodium ions and amino acid

    Which of the statements given above are correct?

    1. 1 and 4

    2. 1 and 2 only

    3. 1, 2 and 3

    4. 2, 3 and 4

  14. A deficiency of pulmonary surfactant would decrease the:

    1. Lung compliance

    2. Work of breathing

    3. Intrapleural pressure to achieve a given tidal volume

    4. Surface tension in the alveoli

  15. Which one of the following is not required for micellar formation?

    1. Bile salts

    2. Monoglyceride

    3. Acetoacetate

    4. Phospholipid