If Mr. Jones has a demand pacemaker implanted, the nurse instructs Mr. Jones that he should notify the physician if he experiences

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

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.

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.

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.

Correct Answer: B

Rationale: The correct answer is B (Approximately 4 to 8 L per minute) because the average cardiac output in a healthy adult at rest is around 5 L per minute. This range of 4 to 8 L per minute encompasses the typical cardiac output values. Choice A (Approximately 4 to 6 L per minute) is too narrow and excludes the upper range, while Choice C (Approximately 5 to 8 L per minute) is slightly broader but still within the acceptable range. Choice D (Approximately 3 to 7 L per minute) is too low and does not cover the full spectrum of average cardiac output values.