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 51. There is no DNA in

A. Hair root

B. An enucleated ovum

C. Mature RBCs

D. A mature spermatozoan

Answer: C

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52. In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart ?

A. P-depolarisation of the atria

B. R-repolarisation of ventricles

C. S-start of systole

D. T-end of diastole

Answer: A

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53. The apex beat of heart is synchronous with

A. First sound

B. Second sound

C. Third sound

D. Fourth sound

Answer: A

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54. Covering of heart is called

A. Pericardium

B. Peritoneum

C. Perineurium

D. Periostium

Answer: A

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55. Post caval in the right auricle is guarded by

A. Eustachian valve

B. Bicuspid valve

C. Tricuspid valve

D. Atrio-ventricular valve

Answer: A

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56. Tunica media of an elastic artery is made

up mainly

A. Smooth muscle fibre

B. Loose alveolar tissue

C. Elastic fibers

D. Collagen fibres

Answer: A

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57. How much of the total blood volume is

present in heart

A. 0.025

B. 0.17

C. 0.09

D. 0.15

Answer: A

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58. Pylangium is part of

A. Truncus arteriosus

B. Left atrium

C. Right atrium

D. Ventricles

Answer: A

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59. The coronary sinus in the heart is situated

along its

A. Left margin

B. Right margin

C. Diaphragmatic surface

D. Lower boarder of the heart

Answer: B

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60. In all the leads of ECG, all the following are positive waves except

A. P

B. Q

C. R

D. T

Answer: B

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