Cardiovascular System Quiz PDF

 1. **Which of the following components are part of the cardiovascular system?**   A) Heart only   B) Blood vessels only   C) Heart, blood, and blood vessels   D) Heart and blood only **Answer:** C  2. **Why does the heart develop early in the human embryo?**   A) To maintain body temper...

 1. **Which of the following components are part of the cardiovascular system?**   A) Heart only   B) Blood vessels only   C) Heart, blood, and blood vessels   D) Heart and blood only **Answer:** C  2. **Why does the heart develop early in the human embryo?**   A) To maintain body temperature   B) To transport nutrients to developing organs   C) Because it is the last organ to develop   D) To maintain body structure **Answer:** B  3. **What is the primary function of the heart?**   A) Generate blood cells   B) Pump blood with sufficient pressure   C) Store blood   D) Filter impurities **Answer:** B  4. **The right side of the heart pumps blood to the:**   A) Lungs   B) Brain   C) Body tissues   D) Digestive system **Answer:** A  5. **The left ventricular wall is thicker because:**   A) It pumps blood at higher pressure   B) It receives less blood   C) It pumps blood only to the lungs   D) It requires less force **Answer:** A  6. **Which valve prevents backflow from the ventricles to the atria?**   A) Pulmonary valve   B) Tricuspid valve   C) Aortic valve   D) Semilunar valve **Answer:** B  7. **When pressure is greater behind a valve, it will:**   A) Close   B) Remain static   C) Open   D) Vibrate **Answer:** C  8. **What structure connects cardiac muscle cells end-to-end?**   A) Synapses   B) Intercalated discs   C) Sarcomeres   D) Fascia adherens **Answer:** B  9. **What is the main function of desmosomes in cardiac muscle cells?**   A) Provide energy   B) Hold cells together during contraction   C) Enable cell division   D) Store oxygen **Answer:** B  10. **Which cells in the heart initiate action potentials?**   A) Contractile cells   B) Autorhythmic cells   C) Blood cells   D) Platelets **Answer:** B  11. **Autorhythmic cells are unique because they:**   A) Do not contract   B) Pump blood   C) Are involved in immunity   D) Function like nerves **Answer:** A  12. **The SA node is considered the pacemaker because it:**   A) Has the fastest rate of action potential generation   B) Is located in the ventricle   C) Conducts the slowest impulses   D) Controls all muscles **Answer:** A  13. **The AV node delay is essential for:**   A) Ventricular filling   B) Immediate atrial and ventricular contraction   C) Blood oxygenation   D) Generating the heart rhythm **Answer:** A  14. **Which fibers ensure rapid and simultaneous excitation of ventricles?**   A) SA node   B) AV node   C) Purkinje fibers   D) Cardiac muscle fibers **Answer:** C  15. **The primary cause of cardiac arrhythmias is:**   A) Low blood pressure   B) Disruption in impulse conduction   C) Excess red blood cells   D) High heart rate **Answer:** B  16. **Which heart chamber receives deoxygenated blood from the body?**   A) Left atrium   B) Right atrium   C) Right ventricle   D) Left ventricle **Answer:** B  17. **In a normal ECG, the T wave represents:**   A) Atrial depolarization   B) Atrial repolarization   C) Ventricular repolarization   D) Ventricular depolarization **Answer:** C  18. **The QRS complex in an ECG indicates:**   A) Ventricular repolarization   B) Atrial repolarization   C) Ventricular depolarization   D) Atrial depolarization **Answer:** C  19. **Which interval in the ECG corresponds to the AV nodal delay?**   A) PR segment   B) ST segment   C) TP interval   D) QT interval **Answer:** A  20. **During sympathetic stimulation, the heart's contractile power:**   A) Decreases   B) Increases   C) Remains the same   D) Reduces cardiac output **Answer:** B  21. **The function of the pulmonary circulation is to:**   A) Provide nutrients to the body   B) Supply oxygen to tissues   C) Exchange gases in the lungs   D) Filter blood **Answer:** C  22. **Atrioventricular (AV) valves prevent backflow:**   A) From atria to ventricles   B) From ventricles to atria   C) Within veins   D) Between capillaries **Answer:** B  23. **Gap junctions in cardiac cells allow:**   A) Structural support   B) Electrical continuity   C) Oxygen transport   D) Blood storage **Answer:** B  24. **What phase of the cardiac cycle occurs when both atria and ventricles are relaxed?**   A) Diastole   B) Systole   C) Contraction phase   D) Recovery phase **Answer:** A  25. **An ectopic focus in the heart refers to:**   A) A disruption in blood flow   B) Abnormal impulse generation outside SA node   C) Normal contraction pattern   D) Increased oxygen saturation **Answer:** B  26. **Which heart chamber pumps oxygenated blood to the body?**   A) Right atrium   B) Left atrium   C) Right ventricle   D) Left ventricle **Answer:** D  27. **The atrioventricular node (AV node) is located in the:**   A) Right atrium   B) Left atrium   C) Right ventricle   D) Left ventricle **Answer:** A  28. **Which component directly follows the AV node in the electrical conduction system?**   A) Purkinje fibers   B) Bundle of His   C) SA node   D) Internodal pathway **Answer:** B  29. **The T-P interval in the ECG represents:**   A) Complete repolarization of ventricles   B) Complete depolarization of atria   C) Contraction of ventricles   D) Contraction of atria **Answer:** A  30. **Increased parasympathetic stimulation of the heart results in:**   A) Increased heart rate   B) Decreased heart rate   C) Constant heart rate   D) Increased stroke volume **Answer:** B.