XI Biology Circulation Online Test Mdcat-2024

Instructions for Circulation Online Test Mdcat-2024:

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Test Details:

Subject: Biology
Class: 1st year or 11
Chapter Name: Circulation
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price : Free

1500

Created on July 26, 2024 By

medicoengineer.com

XI Biology Circulation Online Test Mdcat-2024

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NameEmailPhone Number

1 / 50

1. In ECG, Depolarization of the atrial fibers in SA node Produces_______.

a) P wave

b) Q wave

c) R wave

d) S wave

2 / 50

2. In hot Summer Arterioles are ________.

a) Vasodilated

b) Expanded

c) Vasoconstricted

d) Both A and B

3 / 50

3. The spleen is primarily responsible for:

a) Producing Red blood cells

b) Absorbing nutrients from the digestive tract

c) Filtering blood and destroying foreign particles and aged blood cells

d) Transporting oxygen to various tissues in the body

4 / 50

4. What role do lymph vessels in villi play in the small intestine?

a) Absorbing carbohydrates and proteins from digested food.

b) Absorbing digested fats released as fat globules into the interstitial fluid.

c) Transporting glucose directly into the bloodstream

d) Filtering blood cells and destroying bacteria

5 / 50

5. Tick the incorrect statement:

a) Hypertension is diagnosed when mean arterial pressure is higher than the upper range.

b) Obesity and high salt intake are related to hypertension.

c) Heredity does not affect blood pressure.

d) Smoking is a factor that can contribute to hypertension.

6 / 50

6. Tick the correct statement:

a) Women of any age are considered to have hypertension if their blood pressure reading is 150/90 or above.

b) For a man under age 45, a reading above 130/85 is considered hypertensive.

c) Hypertension is called the "Silent Killer" because it has no symptoms until a stroke or heart attack occurs.

d) High physical activity is responsible for hypertension.

7 / 50

7. During open heart surgery, what machine is the patient placed on?

a) Defibrillator

b) Angiogram machine

c) Heart-lung machine

d) MRI machine

8 / 50

8. What device is used in angioplasty to open up the narrowed artery?

a) Heart-lung machine

b) Stent

c) Balloon catheter

d) Defibrillator

9 / 50

9. What is angioplasty primarily used for?

a) To improve the flow of blood through a narrowed artery

b) To measure blood pressure

c) To repair heart valves

d) To treat heart failure

10 / 50

10. Which of the following is a treatment for narrowed or blocked coronary arteries?

a) Angiography

b) Angina pectoris

c) Heart failure

d) Coronary bypass

11 / 50

11. What is angiography used for?

a) Treating blocked arteries

b) Imaging blood flow in the body

c) Measuring heart rate

d) Checking for heart valve defects

12 / 50

12. What is a congenital heart problem?

a) A blockage of coronary arteries

b) A problem with the structure of the heart present at birth

c) A temporary chest pain

d) An overactive heart muscle

13 / 50

13. Which condition is characterized by the heart's inability to pump sufficient blood to the body?

a) Angina pectoris

b) Heart failure

c) Heart attack

d) Congenital heart problem

14 / 50

14. What is a factor that causes atherosclerosis?

a) Low blood pressure

b) Smoking

c) High physical activity

d) Low serum cholesterol level

15 / 50

15. What initiates the formation of a thrombus within an intact blood vessel?

a) Red blood cells

b) White blood cells

c) Atherosclerotic plaques

d) Calcium deposits

16 / 50

16. What happens if an embolus becomes stuck and severely blocks the flow of blood?

a) Thrombosis

b) Embolism

c) Atherosclerosis

d) Arteriosclerosis

17 / 50

17. Types of mechanoreceptors that sense blood pressure are known as _____.

a) Sphygmomano-receptors

b) Baroreceptors

c) Pressure-receptors

d) Nociceptors

18 / 50

18. The correct statement regarding blood pressure is:

a) Blood pressure is measured with a sphygmomanometer

b) Normal adult blood pressure is 120/80 mmHg

c) Normal systolic blood pressure is 120 mmHg

d) All are correct

19 / 50

19. The hydrostatic force of blood exerted on the walls of blood vessels is called ________.

a) Hydrostatic pressure

b) Blood pressure

c) Mean Pressure

d) Total Pressure

20 / 50

20. Why does blood flow slower in capillaries than in arteries?

a) Because arteries have a wider diameter than capillaries

b) Individual capillary has a wider diameter than an individual artery

c) Capillary beds have an enormous number of capillaries so the total diameter of these vessels is much greater than the arteries

d) Capillary beds have an enormous number of capillaries so the total diameter of these vessels is much lesser than the arteries

21 / 50

21. In systematic circulation, arteries carry _________ blood and have a ___________.

a) Deoxygenated; bright red color

b) Oxygenated; bright red color

c) Oxygenated; blue color

d) Deoxygenated; blue color

22 / 50

22. Which statement best describes the flow of blood in pulmonary circulation?

a) Blood flows from the left atrium to the left ventricle, then to the lungs

b) Blood flows from the right ventricle to the right atrium through the lungs

c) Blood flows from the right ventricle to the pulmonary arteries, then to the lungs, and back to the left atrium via the pulmonary veins

d) Blood flows from the left ventricle to the pulmonary arteries, then to the lungs, and back to the right atrium via the pulmonary veins

23 / 50

23. Which part of the heart first receives deoxygenated blood from the body in systemic circulation?

a) Right atrium

b) Left atrium

c) Right ventricle

d) Left ventricle

24 / 50

24. Which property of veins prevents the backflow of blood?

a) High pressure

b) High resistance

c) One-way valves

d) All of these

25 / 50

25. Capillaries diameter ranges from:

a) 6-9 μm

b) 3-6 μm

c) 5-10 μm

d) 7-9 μm

26 / 50

26. Arteries are thick-walled vessels made up of three layers: _______ , ________ and ____________.

a) Tunica Externa; Tunica Media; Tunica interna

b) Tunica Outerna; Tunica Intermedia; Tunica Interna

c) Tunica Outerna; Tunica Media; Tunica Interna

d) Tunica Externa; Tunica Intermedia; Tunica Interna

27 / 50

27. In systematic circulation, blood leaves the heart via _________ and enters back to the heart via _______.

a) Aorta; Arterioles

b) Arterioles; Aorta

c) Aorta; Vena Cava

d) Vena cava; Aorta

28 / 50

28. Where is the atrioventricular (AV) node located, and what is its primary role in cardiac conduction?

a) In the left atrium, delaying impulses to ensure the ventricles fill with blood before contracting

b) In the wall between the right atrium and right ventricle, delaying impulses by about 0.1 second to ensure the atria contract first and empty completely before the ventricles contract

c) In the right ventricle, accelerating impulses to synchronize with atrial contraction

d) In the interventricular septum, acting as the primary pacemaker for the ventricles

29 / 50

29. Which region maintains the pumping rhythms of the heart?

a) Sinoatrial Node (SAN)

b) Pacemaker

c) Both of these

d) None of these

30 / 50

30. Which one is the correct statement:

a) When the heart beats a sound, LUB-DUB is heard

b) LUB is caused by semilunar valves closure

c) DUB is caused by atrioventricular valves closure

d) All are correct

31 / 50

31. The normal heartbeat of a person is:

a) 72 beats per minute at rest

b) 72 beats per minute while running

c) 110 beats per minute at rest

d) 110 beats per minute while running

32 / 50

32. The contractions of heart chambers are known as:

a) Heartbeats

b) Cardiac cycle

c) Heart cycle

d) All of these

33 / 50

33. The cavity of left ventricle is narrower than right ventricle in humans because:

a) Left ventricle has more muscular walls

b) There is no reason

c) It’s a wrong statement because right ventricle has a narrower cavity

d) Both ventricles have the same size of cavity

34 / 50

34. What separates the right atrium and left atrium?

a) Coronary sulcus

b) Interatrial septum

c) Interventricular septum

d) Atrioventricular septum

35 / 50

35. Which layer of the heart wall is known for its muscular nature?

a) Epicardium

b) Myocardium

c) Endocardium

d) Pericardium

36 / 50

36. What is the pericardium?

a) A chamber of the heart

b) The thick covering that encloses the heart and roots of the major heart vessels

c) A type of heart valve

d) A layer of the myocardium

37 / 50

37. All circulatory systems have _____ major components.

a) Three

b) Four

c) Two

d) Five

38 / 50

38. Which type of circulation ensures complete separation of oxygenated and deoxygenated blood?

a) Incomplete circulation

b) Complete double circuit circulation

c) Single circuit circulation

d) Mixed circulation

39 / 50

39. In complete double circuit circulation, where does the oxygenated blood from the lungs enter the heart?

a) Right atrium

b) Right ventricle

c) Left atrium

d) Left ventricle

40 / 50

40. Four-chambered heart is found in:

a) Mammals

b) Crocodiles

c) Birds

d) All

41 / 50

41. Which type of circulation do amphibians and reptiles have?

a) Double circuit circulation

b) Single circuit circulation

c) Triple circuit circulation

d) Quadruple circuit circulation

42 / 50

42. In single circuit circulation, where does deoxygenated blood from the body enter the heart?

a) Ventral vein

b) Dorsal aorta

c) Atrium

d) Capillary

43 / 50

43. How many chambers does the heart of fish have?

a) Two

b) Three

c) Four

d) One

44 / 50

44. Which animals have a closed circulatory system?

a) Arthropods

b) Mollusks

c) Vertebrates

d) Insects

45 / 50

45. In a closed circulatory system, blood is confined to what?

a) Vessels

b) Sinuses

c) Cavities

d) Spaces

46 / 50

46. What happens to the ostia in the heart of arthropods when the heart contracts?

a) They are closed

b) They are opened

c) They pump blood

d) They release haemolymph

47 / 50

47. In arthropods, the heart pumps haemolymph into which structure?

a) Dorsal artery

b) Ventral vein

c) Dorsal aorta

d) Lateral vessel

48 / 50

48. Where does the haemolymph get pumped in arthropods?

a) Into the veins

b) Into the sinuses

c) Into the capillaries

d) Into the arteries

49 / 50

49. What is the fluid called in an open circulatory system that is a mixture of blood and interstitial fluid?

a) Haemolymph

b) Plasma

c) Cytosol

d) Serum

50 / 50

50. In which types of animals is an open circulatory system primarily found?

a) Mammals

b) Arthropods

c) Birds

d) Amphibians

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