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Biology |
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| 271)The aperture between right auricle and right ventricle is guided by one way valve called the | |||
| Valve of inferior vena cava | Bicuspid vavle | ||
| Tricuspid valve | semilunar valve | ||
| Answer : | |||
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| 272)Mammals have a double circulatory system. It means that | |||
| There are two systems, one from heart to lunngs and back to the rest of the body via heart | The blood circulates twice in the heart | ||
| There are two tyes of blood vessels attached to every organs that is an artery and a vein | Both (a) and (b) | ||
| Answer : | |||
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| 273)Time taken by the impulse to travel through atria, AV node and the rest of conducting tissue is | |||
| PQRS interval | PQ interval | ||
| ST interval | QRS interval | ||
| Answer : | |||
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| 274)A cardiac cycle involves | |||
| Auricular systole-ventricular systole-complete cardiac distole | Joint diastole-ventricular systole-auricular systole | ||
| Auricular systole-ventricular distole-Joint diastole | Auricular systole-Joint diastole-ventricular systole | ||
| Answer : | |||
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| 275)The duration of the ventricular diastole in a normal cardiac cycle is | |||
| 0.5 sec | 0.2 sec | ||
| 0.3 sec | 0.7 sec | ||
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| 276)Which layer of the heart is responsible for differential thickness of different chambers of it? | |||
| Pericardium | Epicardium | ||
| Myocardium | Endocardium | ||
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| 277)Coagulation of blood in the vessels is prevented during normal conditions by | |||
| Heparin | Plasminogen | ||
| Calcium | Prothrombin | ||
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| 278)RBC in mammals do not have nucleus because | |||
| It decreases surface area | Nucleus is harmful for RBC | ||
| It has degenerated during development | They do not have nucleus since their formation | ||
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| 279)Blood platelets are the fragments of | |||
| Rubricyte | Megakaryocyte | ||
| Normocyte | Retriculocytes | ||
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| 280)Lymph differs from blood in possessing | |||
| Less proteins and more waste products | More proteins and more waste products | ||
| More proteins and less waste products | Less proteins and less waste products | ||
| Answer : | |||
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| 281)The course of blood from the heart to the lungs and back to the heart is called | |||
| Double type circulation | Single type circulation | ||
| Systemic circular | Pulmonary circulation | ||
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| 282)The centre of heart beat regulation is present in | |||
| Medulla | Cerebrum | ||
| Pons varolii | Cerebellum | ||
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| 283)Which of the pulmonary byepass are present in the circulatory system before birth ? | |||
| Ductus arteriosus | Foramen Ovale | ||
| Conus arteriosus | Both (a) and (b) | ||
| Answer : | |||
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| 284)Which one of the following lies in the wall of right auricle | |||
| Chordae tendinae | SA node | ||
| Purkinje Fibres | Bundle of His | ||
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| 285)Thoracic duct opens into | |||
| Right subclavian vein | Left subclavian vein | ||
| Left subclavian artery | Right subclavian artery | ||
| Answer : | |||
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