Question 4

The primary purpose of this passage is to inform the reader how the cardiovascular system regulates blood pressure.

The passage provides a detailed explanation of the components involved in regulating blood pressure within the cardiovascular system, particularly focusing on baroreceptors, chemoreceptors, and the kidneys.

A) To inform the reader about the dangers of high blood pressure

This option is incorrect because the passage does not address the dangers associated with high blood pressure. Instead, it emphasizes the regulatory mechanisms that maintain blood pressure rather than any negative health consequences.

B) To inform the reader how high blood pressure leads to a higher risk of heart attack

This option is also incorrect as the passage does not discuss the relationship between high blood pressure and heart attack risks. The focus is solely on the regulatory processes rather than the implications of high blood pressure.

C) To inform the reader how the cardiovascular system regulates blood pressure

This option is correct because the passage specifically describes the roles of various components, such as baroreceptors, chemoreceptors, and the kidneys, in maintaining blood pressure within the cardiovascular system.

D) To persuade the reader that controlling one's blood pressure is important

While controlling blood pressure is important, this option is incorrect as the passage does not aim to persuade the reader. It simply presents information on blood pressure regulation without advocating for any particular action.

Conclusion

The correct answer is definitively C, as the passage centers around explaining the mechanisms through which the cardiovascular system regulates blood pressure. Other options fail because they either misinterpret the passage's intent or introduce topics not covered in the text, such as the dangers of high blood pressure or the importance of controlling it.