Which kidney-related term is represented by the root 'nephr/o'?

The root 'nephr/o' specifically refers to the kidney in medical terminology. This term originates from the Greek word 'nephros,' which means kidney. Understanding this root is essential for recognizing various medical terms related to kidney function and pathology, such as nephritis (inflammation of the kidney) or nephrology (the study of kidney diseases).

The other choices refer to different body parts or systems. For instance, the heart muscle is indicated by the prefix 'cardi/o,' while bone marrow is associated with the term 'myel/o.' The spinal cord is referenced with 'myel/o' as well, specifically in the context of the spinal cord or bone marrow. Recognizing these distinctions can help in grasping the broader scope of medical terminology and ensuring accurate communication within the healthcare field.