Question

what does the combining form cardi/o mean?
○ a. heart
○ b. muscle
○ c. veins
○ d. lymph vessels, nodes, and fluid

Explanation:

In medical terminology, the combining form "cardi/o" is derived from the Greek word "kardia" which means heart. For example, terms like "cardiology" (the study of the heart) use "cardi/o" to refer to the heart. Option b (muscle) would be related to "my/o", option c (veins) to "phleb/o" or "ven/o", and option d (lymph vessels, nodes, and fluid) to "lymph/o" or related combining forms. So the correct meaning of "cardi/o" is heart.

Answer:

a. heart