Cardiovascular System Exam Questions And Answers

Cardiovascular System Exam Questions And Answers Related

Review Cardiovascular System Exam Questions And Answers related questions and content

Which heart chamber receives oxygenated blood from the lungs and pumps it to the rest of the body?

  • A. Left atrium
  • B. Right atrium
  • C. Left ventricle
  • D. Right ventricle
Correct Answer: C

Rationale: The correct answer is C, the left ventricle. The left ventricle receives oxygenated blood from the lungs through the left atrium and pumps it to the rest of the body via the aorta. This chamber has thicker muscular walls compared to the right ventricle to generate enough force to propel blood throughout the body. The left atrium receives oxygenated blood from the lungs but does not pump blood out to the body. The right atrium receives deoxygenated blood from the body and sends it to the right ventricle, which then pumps it to the lungs for oxygenation. Therefore, choices A, B, and D are incorrect as they do not accurately describe the function of the heart chamber that receives oxygenated blood from the lungs and pumps it to the rest of the body.

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This is a branch of the left coronary arteries which supplies the LEFT ATRIUM, posterior lateral surface of the left ventricle.

  • A. Right coronary artery
  • B. Left circumflex artery
  • C. Left anterior descending artery
  • D. Posterior descending artery
Correct Answer: B

Rationale: The correct answer is B, the Left circumflex artery. This artery branches off the left coronary artery and supplies the left atrium and the posterior lateral surface of the left ventricle. The Left anterior descending artery (C) supplies the anterior surface of the left ventricle. The Right coronary artery (A) supplies the right atrium and right ventricle. The Posterior descending artery (D) is a branch of the right coronary artery and supplies the posterior wall of the left ventricle. Therefore, B is the correct answer based on the specific areas supplied by each artery.

Which heart chamber ejects blood into the lungs via the pulmonary artery?

  • A. Right atrium
  • B. Left atrium
  • C. Right ventricle
  • D. Left ventricle
Correct Answer: C

Rationale: The correct answer is C, the right ventricle. The right ventricle is responsible for pumping deoxygenated blood to the lungs via the pulmonary artery for oxygenation. This process occurs during the pulmonary circulation phase of the cardiac cycle. The right atrium receives deoxygenated blood from the body and pumps it into the right ventricle. The right ventricle then contracts to push the blood through the pulmonary valve and into the pulmonary artery. The left atrium receives oxygenated blood from the lungs, which is then pumped into the left ventricle for distribution to the rest of the body. Therefore, choices A, B, and D are incorrect as they do not directly involve the ejection of blood into the lungs via the pulmonary artery.

After the AV node, the electrical impulse is then transmitted into the _________, and into the _________.

  • A. Purkinje fibers, ventricles
  • B. Atria, ventricles
  • C. Bundle of His, Purkinje fibers
  • D. Ventricles, Purkinje fibers
Correct Answer: C

Rationale: The correct answer is C: Bundle of His, Purkinje fibers. After the AV node, the electrical impulse is transmitted to the Bundle of His, which then branches into the Purkinje fibers to spread the impulse throughout the ventricles. This sequence ensures coordinated and efficient contraction of the heart muscle. Choices A, B, and D are incorrect because they do not follow the physiological pathway of the electrical conduction system of the heart. The Purkinje fibers are responsible for transmitting the impulse to the ventricles, not the atria or vice versa as suggested in the other choices.

At what point in the healing process of the myocardium following an infarct does early scar tissue result in an unstable heart wall?

  • A. 2 to 3 days after MI
  • B. 4 to 10 days after MI
  • C. 10 to 14 days after MI
  • D. 6 weeks after MI
Correct Answer: B

Rationale: Scar tissue forms 4 to 10 days post-MI.

The most life-threatening cardiac arrhythmia following myocardial infarction is

  • A. ventricular fibrillation
  • B. premature ventricular contractions
  • C. premature atrial contractions
  • D. atrial fibrillation
Correct Answer: A

Rationale: Ventricular fibrillation disrupts cardiac function and requires immediate intervention.

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