Question

heart
immune
urinary-renal
circulatory
a state of complete physical, mental, and social well - being and not merely the absence of disease

Explanation:

The heart is part of the circulatory system as it pumps blood, so the "circulatory" option (green box) is correct. The immune system deals with defense, urinary - renal with kidneys/urine, and the red box defines health, not the system the heart belongs to.

Answer:

The green box labeled "circulatory"