MCQ of THORAX for practice……………..Dr. Ashfaq.

1. The right lung- 6. Relation of base of left lung are-a Is larger than the left a fundus of the stomachb Is divided by fissures into the upper and lower

lobes and the lingulab right lobe of the liver

c Possesses 10 BPSs c spleend Is less prone to infection d left kidneye Is related inferiorly to the liver e left suprarenal gland

2. Intercostal nerves- 7. Intercellular junctions within intercalated discs are-

a are ventral ramus of thoracic spinal nerve a zonula occludentesb are 12 pairs in number b fascia adherentesc are purely motor nerves c macula adherentesd lie below intercostal vessels d gap junctionse carry GVE fibers e tight junctions

3. The thymus- 8. Aortic opening of the diaphragm transmits-a develops from 2nd pharyngeal pouch a arch of the aortab contains Hassal’s corpuscle b right phrenic nervec is a central lymphoid organ c azygos veind produces B lymphocyte d vagus nervee secretes some hormone e thoracic duct

4. Branches of arch of the aorta are- 9. Respiratory unit includes-a coronary arteries a segmental bronchusb brachiocephalic trunk b respiratory bronchiolec left subclavian artery c terminal bronchiole d right common carotid artery d alveolar sacse pulmonary trunk e alveoli

5. Sternum- 10. Fibrous pericardium-a is a flat bone a is also called epicardiumb is a membranous bone b is intimately blended with central tendon of

the diaphragmc forms anterior boundary of the mediastinum c develops from splanchnopleuric layer of

lateral plate mesodermd contains red marrow throughout life d is supplied by autonomic nervese is formed by fusion of 5 sternebrae e is pain sensitive

11. The thoracic trachea- 16. Nonkeratinized stratified squamous epithelium is found in-

a Bifurcates at the level of the sternal angle a tongueb Is closely related to the esophagus b esophagusc Has complete fibrocartilaginous rings within

its wallsc thoracic duct

d Is related anteriorly to the thyroid gland d skine Ends at the level of the sternal angle e stomach

12. Contents of the middle mediastinum are- 17. Gaseous exchange occurs in-a thymus a tracheab trachea b primary bronchusc heart c lobar bronchus d thoracic duct d alveolar sacse ascending aorta e alveoli

13. A typical thoracic vertebra has- 18. Parts of the parietal pleura are-a heart shaped body a costal pleurab demifacet on body b mediastinal pleurac foramen transversarium c visceral pleurad mammilary process d pulmonary pleurae short, slender transverse process e diaphragmatic pleura

14. Fate of the fertilization include- 19. Branches of the internal thoracic artery are-a determination of chromosomal sex a superior phrenic arteryb restoration of haploid number of chromosome b superior epigastric arteryc initiation of cleavage c posterior intercostal arteryd formation of blastocyst d musculophrenic arterye formation of morula e pericardiophrenic artery

14. Coronary arteries are- 19. Azygos vein-a the very first branches of arterial system a receives blood from bronchial veinsb vasa vasorum b is pairedc elastic arteries c join superior & inferior vena cavad connected to each other by actual anastomosis d enters thoracic cavity through aortic openinge functional end arteries e drains into inferior vena cava

1. The adult heart- 6. The right ventricle-a Is related posteriorly to the esophagus, left

main bronchus and aortaa Forms most of the inferior surface of the

heartb Lies on the left dome of the diaphragm b Is normally oval in cross sectionc In health weighs approximately 900 gm c Has a tricuspid valve in its inflow partd Admits the great veins on its posterior surface d Usually contains three conical papillary

musclese Is totally enclosed by the serous pericardium e Possesses a pulmonary orifice guarded by a

tricuspid valve

2. The mitral valve- 7. The ascending aorta-

a Possesses two cusps a Ascends as far as the right sternoclavicular joint

b Guards the right atrioventricular orifice b Lies intrapericardiallyc Is closely related to the aortic valve c Has no branchesd Has no papillary muscle attachments d Is related posteriorly to the right main

bronchuse Lies on the posterior wall of the left ventricle e Is related anteriorly to the sternum

3. The thoracic duct- 8. The lung tissue-a Arises in the thorax a Receives its oxygenated arterial supply via

branches of the thoracic aortab Ascends anterior to the vertebral column b Has venous drainage into the azygos system

of veinsc Drains into the left brachicephaliv vein c Has no lymph drainaged Drains mainly thoracic structures d Has ciliated columnar epithelial lining

throughoute Is joined by the right lymphatic duct e Receives a nerve supply from the vagus

5. The thoracic esophagus- 10. The pulmonary trunk-a Lies posterior to the trachea a Lies at its origin to the root of the aortab Is directly related to the vertebral column

throughout its courseb Is connected to within a common sleeve of

serous pericardium with the ascending aortac Is related to the left atrium c Bifurcates anterior to the aortic archd Pierces the central tendon of the diaphragm at

the level of the 8th thoracic vertebrad Is related to the left pleura and lung

e Is crossed by the left bronchus e Is closely related to both right and left coronary arteries

3. First thoracic vertebra/’s- 8. Primary cartilaginous joints are-a is typical a sternoclavicularb presents two demifacets on body b costovertebralc vertebral foramen is small c first sternocostald superior vertebral notch is prominent d xiphisternale spinous process is directed horizontally e costochondral

4. Muscle(s) of inspiration include(s)- 9. Azygos vein-a External intercostal a ends into inferior vena cavab Pectoralis major b is a part of portal circulationc The diaphragm c has no valved Serratus anterior d connects superior & inferior vena cava e Internal intercostal of same side e passes through vena caval opening of

diaphragm