Which vertebrate body system is most closely associated functionally with respiration?
A) urinary
B) digestive
C) endocrine
D) circulatory
E) integumentary

Question

Quizplus · Accepted Answer

The circulatory system is most closely associated with respiration as it transports oxygen from the lungs to the body's tissues and carries carbon dioxide from the tissues back to the lungs for exhalation.

Which Vertebrate Body System Is Most Closely Associated Functionally with Respiration