Question 29

Several systems maintain the body's natural functions, with the cardiovascular system regulating blood pressure through baroreceptors, chemoreceptors, and the kidneys.

This summary encapsulates the main points of the passage, highlighting the role of the cardiovascular system and its components in regulating blood pressure.

A) The body's pump, the heart, regulates the flow of oxygen to all cells of the body and discards waste products like carbon dioxide. The kidneys assist by absorbing salts and water.

While this option mentions the heart's function and the kidneys' role in managing salts and water, it does not address the regulation of blood pressure through the various components discussed in the passage. It presents an incomplete perspective.

B) There are several systems that maintain the body's natural functions. The cardiovascular system regulates blood pressure through baroreceptors, chemoreceptors, and the kidneys.

This option accurately summarizes the essence of the passage by addressing the overall systems involved in maintaining bodily functions, specifically focusing on the cardiovascular system's role in blood pressure regulation through its key components.

C) Baroreceptors, located along the walls of arteries, help regulate blood pressure by sending impulses to the heart, arteries, and veins.

Although this statement correctly identifies the function of baroreceptors, it is limited in scope as it fails to encompass the broader context of all regulators mentioned in the passage, such as chemoreceptors and the kidneys.

D) Chemoreceptors monitor changes in oxygen levels that impact blood pressure.

This option accurately reflects the function of chemoreceptors; however, it is too narrow, focusing solely on one component of blood pressure regulation without encompassing the entire system as presented in the extract.

Conclusion

Option B is the most comprehensive summary of the passage, effectively incorporating the key elements related to the cardiovascular system and its regulators. The other options, while containing accurate information, either lack breadth or focus on specific details that do not fully capture the overall message regarding blood pressure regulation.