Question Detail
Question
Which of these is NOT associated with circulation in an organism?
Correct Answer
Option D is the correct answer.
Detailed Explanation
The heart, lungs (for gas exchange in pulmonary circulation), and blood vessels are direct components of the circulatory system. The liver plays many metabolic roles, including filtering blood, but it is not considered a primary organ of circulation itself.
Hint
Consider which organ is primarily metabolic rather than directly part of the transport system.