1. Which of the following is NOT a component of the cardiovascular system? A. Heart B. Lungs C. Blood vessels D. Blood Answer: B. Lungs Rationale: The lungs are part of the respiratory system, not the cardiovascular system. 2. Which of the following chambers of the heart is responsible for pumping oxygenated blood to the rest of the body? A. Right atrium B. Left atrium C. Right ventricle D. Left ventricle Answer: D. Left ventricle Rationale: The left ventricle is responsible for pumping oxygenated blood to the body. 3. The pulmonary artery carries deoxygenated blood to which of the following structures? A. Lungs B. Kidneys C. Brain D. Heart Answer: A. Lungs Rationale: The pulmonary artery carries deoxygenated blood from the heart to the lungs for oxygenation. 4. Which of the following is responsible for regulating the heart rate and contraction strength of the heart? A. Atrioventricular node B. Sinoatrial node C. Purkinje fibers D. Bundle of His Answer: B. Sinoatrial node Rationale: The sinoatrial node is the natural pacemaker of the heart and