Question

Choose the letter that best completes the statement or answers the question

21. The portion of the intrinsic conduction system located in the interventricular septum is the
a. AV node b. SA node c. AV bundle d. Purkinje fibers

22. The sequences of contraction of the heart chambers is
a. random b. left chambers followed by the right chambers
c. both atria followed by both ventricles d. right atrium, right ventricle, left atrium, left ventricle  

23. All of the following are arteries that irrigating the heart except:
a. marginal b. interventricular c. coronary d celiac circumflex

24. The area of the conduction system that initiates the heartbeat is/are ________
a. SA node b. Purkinje fibers c. bundle of His d. AV node

25. The _____________ decreases heart rate but genially has not effect on the force of contraction.
a. sympathetic stimulation b. parasympathetic stimulation c. chemical regulation


26. Veins present with the following features except:
a. valves b. transport blood from body to heart
c. lumen wide than arteries d. Tunica media is the thickest

27. The left side of the head is drain by the
a. left lymphatic duct b. right lymphatic duct c. thoracic duct d. axillary node

28. The direction of fluid of the lymph is carried away from the heart
a. T b. F

29. Plasma cells are lymphocytes that
a. produce antibodies b. phagocyte foreign substances
c. produce antigens d. produce reticular fiber stroma

30. Cells that engulf foreign substances and help activate T cell are
a. T cells b. B cells c. Reticular cells d. Macrophages e. Plasma cell

31. Lymph nodes bear fewer afferent lymphatic vessels than efferent lymphatic vessels
a. T b. F

32. The part of the lymph node that house T cell in transit is the
a. medulla b. hilus c. cortex d. capsule

33. All of these organs are part of the lymphatic system except:
a. Spleen b. Thymus c. Pancreas d. Tonsils e. Peyer’s patches

34. The lymphoid organ that functions primarily during the first years of life is the
a. Spleen b. Thymus c. Pancreas d. Tonsils e. Peyer’s patches

35. Which lymphoid organ stores products of red blood cells, is site for erythropoietin before
birth, and stores blood platelets?
a. Spleen b. Thymus c. Pancreas d. Tonsils e. Peyer’s patches

36. The saclike initial portion of the thoracic duct is the
a. lacteal b. right lymphatic duct c. cisterna chyli d. lymph sac

37. The structural framework of lymphoid organs is
a. areolar connective tissue b. hematopoietic tissue c. reticular tissue d. adipose tissue

38. The blood pressure range is greatest in a/an/the:
a. vein b. venule c. capillary d. artery e. arteriole

39. How many different sites are where a pulse can be palpated above the heart?
a. 1 b. 2 c. 3 d. 4 e. 5   

40. Collections of lymphoid tissue (MALT) that guard mucosal surfaces include all of
following except
a. GI tract b. respiratory tract  
c. reproductive tract d. mediastinum e. urinary tract

41. The tricuspid valve is:
a. the left AV valve b. located in the AV junction c. the right AV valve

42. The layer over the external surface of the heart also called visceral layer of the heart is the _______
a. endocardium b. myocardium c. epicardium

43. The _______________ , functional supply of the heart, is the shortest circulation in the body.
a. systemic circulation b. pulmonary circulation c. coronary circulation

44. The relaxation of the period of the heart refers to:
a. contraction b. preload c. diastole d. systole

45. The term bradycardia refers to:
a. amount of blood at any given time in the hart b. a heart rate slower than 60 beat per minute
c. stretch of the heart with each contraction d. an impulse of the AV of 60 times

46. In Tetralogy of Fallot the chamber of the heart that eventually enlarges (hypertrophies) is the __________.
a. left ventricle b. right ventricle c. left atrium d. right atrium   

47. The following are factors used as short terms mechanism to control arterial blood pressure except
a. atrial natriuretic peptide b. renal regulation c. angiotensin II
d. antidiuretic hormone e. adrenal medulla hormones

48. When the heart is inefficient to sustain adequate circulation is called:
a. cardiogenic shock b. vascular shock c. hypovolemic shock d. septic shock

49. Which component of the lymphatic structures is responsible for the formation of all formed elements?
a. spleen b. lymph nodes c. thymus d. red bone marrow e. tonsils

50. Which structure of the lymphatic system initiates the immune response when an organ is attack by a pathogen or tumor?
a. spleen b. lymph nodes c. thymus d. red bone marrow e. tonsils

Answer 1

Question No. 21

Answer :-C. AV bundle

Explanation -AV bundle is portion of the intrinsic conduction system located in the superior interventricular septum of the heart.

Question No 22.

Answer :-C. both atria followed by both ventricles.

Question No 23.

Answer :-D. celiac circumflex

Explanation - celiac artery provides oxygenated blood to the foregut stomach and the liver. .

Question No 24.

Answer :-a. SA node

Explanation - S. A node is present in superior part of atria which initially start conduction of impulse in heart around 75 times per minute ..

Question No 25

Answer :-b. parasympathetic stimulation

Explanation - Sympathetic stimulation: increases rate and strength of contraction; dilates coronary arteries that supply blood to heart muscle and increses heart rate .

Parasympathetic stimulation: Decreases heart rate; constricts coronary arteries... Thanks dear student