Cardiovascular System Quiz PDF
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Summary
This document contains a quiz or exam on the human cardiovascular system, it includes multiple choice questions about components, function. and other important topics. It's geared towards a secondary school or high school level.
Full Transcript
 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.