Final answer:
The circulatory system is responsible for the distribution of oxygen and carbon dioxide throughout the body, involving the heart, blood vessels, and blood.
Step-by-step explanation:
The organ system responsible for the internal distribution of oxygen and carbon dioxide is the circulatory system. This system comprises the heart, blood vessels, and blood. The primary function of the circulatory system is to transport nutrients, gases (such as oxygen and carbon dioxide), hormones, and waste products to and from the cells of the body.
Oxygen from the air we breathe enters the lungs and then diffuses into the blood, where it binds to hemoglobin molecules in the red blood cells. These oxygen-laden cells are then pumped by the heart throughout the body through arteries. After oxygen is delivered to the tissues, carbon dioxide, which is a waste product of cellular respiration, is collected and transported back to the lungs via veins, where it is expelled from the body when we exhale.