Alveoli are associated with which of the following body systems?

Question

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Exchange of gases between the lungs and the blood occur in the alveoli during respiration.Oxygen from the air passes through the thin walls of the alveoli into the bloodstream,and carbon dioxide passes from the blood into the alveoli to be expelled into the air.
The endocrine system relays chemical messages through the body.
The digestive system takes in whole foods and breaks them down into their chemical components.
The integumentary system is responsible for protection of the body and regulation of body temperature.

Alveoli Are Associated with Which of the Following Body Systems