AIPMT PMT Circulatory System Practice Questions
1. Which of the following is correct about human heart?
(a) The volume of both atria > the volume of both ventricles
(b) The volume of both ventricles > the volume of both atria
(c) The volume of both atria = the volume of both ventricles
(d) Ventricles are upper chambers and atria are lower chambers in our heart
2. In humans, blood passes from the post caval to the diastolic
right atrium of heart due to
(a) stimulation of the sino auricular node
(b) pressure difference between the post caval and atrium
(c) pushing open of the venous valves
(d) suction pull.
3. Which one of the following is a matching pair?
(a) Lubb – sharp closure of AV valves at the beginning of ventricular systole
(b) Dup – sudden opening of semilunar valves at the beginning of ventricular diastole
(c) Pulsation of the radial artery – valves in the blood vessels
(d) Initiation of the heart beat – Purkinje fibres
4. Which of the following statements is incorrect?
(a) Veins are typically larger in diameter than arteries.
(b) Because of their small size, blood flows more rapidly in capillaries than in other parts of circulatory system.
(c) Walls of arteries are elastic enabling them to stretch and shrink during changes in blood pressure.
(d) Veins contain more blood than any other part of circulatory system.
5. During ventricular systole
(a) oxygenated blood is pumped into the pulmonary artery and deoxygenated blood is pumped into the artery
(b) oxygenated blood is pumped into the aorta and deoxygenated blood is pumped into the pulmonary vein
(c) oxygenated blood is pumped into the pulmonary vein and deoxygenated blood is pumped into the pulmonary artery
(d) oxygenated blood is pumped into the aorta and deoxygenated blood is pumped into the pulmonary artery.
6. If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?
(a) The flow of blood into the aorta will be slowed down.
(b) The ‘pacemaker’ will stop working.
(c) The blood will tend to flow back into the left atrium.
(d) The flow of blood into the pulmonary artery will be reduced.
7. Which one of the following statements is correct regarding blood pressure?
(a) 130/90 mm Hg is considered high and requires treatment
(b) 100/55 mm Hg is considered an ideal blood pressure
(c) 105/50 mm Hg makes one very active
(d) 190/110 mm Hg may harm vital organs like brain and kidney
8. The given figure is the ECG of a normal human. Which one of its components is correctly interpreted below?
(a) Complex QRS – can help in determining heart rate
(b) Peak T – initiation of total cardiac contraction
(c) Peak P and peak R together – systolic and diastolic blood pressures
(d) Peak P- initiation of left atrial contraction only
9. Which of the following statement(s) regarding the cardiac system is/are correct?
(i) Human heart is an ectodermal derivative.
(ii) Mitral valve guards the opening between the right atrium and left ventricle.
(iii) SAN is located on the left upper corner of the right atrium.
(iv) Stroke volume x Heart rate = Cardiac output.
(a) (i) only (b) (i) and (il)
(c) (ii) and (iii) (d) (iv) only
10. The problem of electrical discontinuity caused in the normal heart by the connective tissue separating the atria from the ventricles is solved by
(a) coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the bundle of His (b) having the A-V node function as a secondary pacemaker
(c) having an ectopic pacemaker
(d) coordinating electrical activity in the atria with electrical activity in the ventricles by connecting them via the vagus nerve.
11. Match Column -1 with Column – II and select the correct option from the codes given below.
|Column -1||Column – II|
|A. Superior vena cava||(i) Carries deoxygenated blood to lungs|
|B. Inferior vena cava||(ii) Carries oxygenated blood from lungs|
|C. Pulmonary artery||(iii) Brings deoxygenated blood from lower part of body to right atrium|
|D. Pulmonary vein||(iv) Bring deoxygenated blood from upper part of body to right atrium|
|(a) Auricular Systole||Joint Diastole||ventricular Systole|
|(b) Ventricular Systole||Joint Diastole||Auricular Systole|
|(c) Ventricular Systole||Auricular Systole||Joint Diastole|
|(d) Joint Diastole||Auricular Systole||Ventricular Systole|
13. What happens when the pacemaker becomes nonfunctional?
(a) Only auricles contract rhythmically
(b) Only ventricles contract rhythmically
(c) Cardiac muscles do not undergo co-ordinated rhythmic movements
(d) Auricles and ventricles contract rhythmically
14. During acute myocardial infarction which of the following changes occurs in the ECG ?
(a) Flattened T wave
(b) Depressed ST segment
(c) Elevated ST segment
(d) Increased length of PQ interval
15. Cardiac activity could be moderated by the autonomous neural system. Which of the following statements is correct?
(a) The parasympathetic system stimulates heart rate and stroke volume.
(b) The sympathetic system stimulates heart rate and stroke volume.
(c) The parasympathetic system decreases the heart rate but increases stroke volume.
(d) The sympathetic system decreases the heart rate but increases stroke volume.
16. Systemic heart refers to
(a) the heart that contracts under stimulation from nervous system
(b) right and left ventricles in higher vertebrates
(c) entire heart in lower vertebrates
(d) the two ventricles together in humans
17. Which of the following chambers of the heart has the thickest muscular wall?
(a) Left atrium (b) Right atrium
(c) Right ventricle (d) Left ventricle
18. Blood pressure is defined as the force with which blood
(a) comes out of the atrium
(b) is pushed to the legs
(c) pushes against wall of blood vessels
(d) comes out of the ventricle.
19. Which of the following is correct regarding each cardiac cycle?
(a) The volume of blood pumped out by the right and left ventricles is same.
(b) The volume of blood pumped out by the right and left ventricles is different.
(c) The volume of blood received by each atrium is different.
(d) The volume of blood received by the aorta and pulmonary artery is different.
20. If the systolic pressure is 120 mm Hg and diastolic pressure
is 80 mm Hg, the pulse pressure is__________.
(a) 120 x 80 = 9600 mm Hg
(b) 120 + 80 = 200 mm Hg
(c) 120 – 80 = 40 mm Hg
(d) 120/80 = 1-5 mm Hg
21. What would be the cardiac output of a person having 72 heart beats per minute and a stroke volume of 50 ml?
(a) 360 mL (b) 3600 mL(c) 7200 mL(d) 5000 mL
22. Blood enters the heart because muscles of the
(a) atrium contracts (b) atrium relaxes
(c) ventricle relaxes (d) ventricle contracts.
23. Carotid artery supplies
(a) oxygenated blood to lungs
(b) oxygenated blood to intestine
(c) oxygenated blood to brain
(d) none of these.
24. In which of the following points pulmonary artery is different from pulmonary vein?
(a) Its lumen is broad (b) Its wall is thick
(c) It has valves
(d) It does not possess endothelium
25. Which of the following contains blood with the lowest oxygen content?
(a) Aorta (b) Left atrium
(c) Right ventricle (d) Pulmonary veins
26. Which of the following correctly ranks pressures during isovolumetric contraction of a normal cardiac cycle?
(a) left ventricular > aortic > left atrial
(b) aortic > left atrial > left ventricular
(c) left atrial > aortic > left ventricular
(d) aortic > left ventricular > left atrial
27. Which of the following is not characteristic of the body’s capillaries?
(a) large total surface area
(b) thin walls
(c) high blood velocity
(d) highly branched
28. Which statement comparing the systemic and pulmonary circuit is true?
(a) The blood flow is greater through the systemic
(b) The blood flow is greater through the pulmonary
(c) The absolute pressure is higher in the pulmonary
(d) The blood flow is the same in both
29. What is mainly responsible for the delay between the atrial and ventricular contractions?
(a) The shallow slope of AV node pacemaker potentials
(b) Slow action potential conduction velocity of AV node cells
(c) Slow action potential conduction velocity along atrial muscle cell membranes
(d) Slow action potential conduction in the the Purkinje network of the ventricles
30. When a person engages in strenuous, prolonged exercises,
(a) blood flow to the kidneys is reduced
(b) cardiac output is reduced
(c) systolic arterial blood pressure is reduced
(d) blood flow to the brain is reduced.