ATI RN
Cardiovascular System Exam
1. Which structure serves as the major chemoreceptor of the heart?
- A. Carotid body
- B. Aortic body
- C. Vagus nerve
- D. SA node
Correct answer: A
Rationale: The correct answer is A, the carotid body. The carotid body is the major chemoreceptor of the heart responsible for detecting changes in blood oxygen, carbon dioxide, and pH levels. This specialized structure helps regulate the cardiovascular system's response to maintain appropriate oxygen levels in the blood. Choices B, C, and D are incorrect as they are not directly involved in chemoreception in the heart. The aortic body is primarily involved in blood pressure regulation, the vagus nerve is a cranial nerve responsible for parasympathetic innervation, and the SA node is known as the heart's natural pacemaker.
2. What is the first sign of puberty in boys?
- A. Enlargement of testes
- B. Decreased levels of testosterone
- C. Voice deepening
- D. Pubic hair
Correct answer: A
Rationale: The first sign of puberty in boys is typically the enlargement of the testes. This is due to the increase in production of testosterone, which leads to physical changes such as growth of the testes. Choice B, decreased levels of testosterone, is incorrect as puberty is marked by an increase in testosterone levels. Choice C, voice deepening, and choice D, pubic hair growth, usually occur later in the puberty process compared to testicular enlargement, making them incorrect answers.
3. The nurse is discussing toddler development with a parent. Which intervention will foster the achievement of autonomy?
- A. Help the toddler complete tasks
- B. Encourage the toddler to do things for themselves when capable
- C. Provide opportunities for the toddler to play with other children
- D. Help the toddler learn the difference between right and wrong
Correct answer: B
Rationale: Encouraging the toddler to do things for themselves when capable is the correct intervention to foster autonomy. This approach helps the toddler develop independence, self-confidence, and a sense of achievement. Choice A is incorrect as it focuses on assisting rather than encouraging independence. Choice C is incorrect as playing with other children primarily fosters social skills, not necessarily autonomy. Choice D is incorrect as learning the difference between right and wrong is related to moral development, not autonomy.
4. A nurse is caring for a client who reports a decrease in the effectiveness of their arthritis medication. What factor should the nurse identify as contributing to this decrease?
- A. Improved mobility
- B. Bowel inflammation
- C. Long-term use of the medication
- D. Frequent dehydration
Correct answer: B
Rationale: The correct answer is B: Bowel inflammation. Bowel inflammation can decrease the absorption of medications, reducing their effectiveness. Improved mobility (choice A) would generally not contribute to a decrease in medication effectiveness. Long-term use of the medication (choice C) may lead to tolerance but would not directly cause a decrease in effectiveness. Frequent dehydration (choice D) can affect overall health but is not a direct factor in the medication's effectiveness for arthritis.
5. What is a surgical procedure to redirect blood flow around a blocked or narrowed artery, often involving the use of a graft from another part of the body?
- A. Coronary artery bypass graft (CABG)
- B. Valve replacement
- C. Aneurysm repair
- D. Atherectomy
Correct answer: A
Rationale: The correct answer is A: Coronary artery bypass graft (CABG). This surgical procedure is used to redirect blood flow around a blocked or narrowed artery by using a graft from another part of the body. Choices B, C, and D are incorrect because valve replacement involves replacing heart valves, aneurysm repair addresses the treatment of aneurysms, and atherectomy is a procedure to remove plaque from blood vessels, none of which match the description provided in the question.
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