Figure 3 shows two other organ systems that you may be familiar with. Q3. Can you identify these organ systems? Q4. How do these organ systems work together? Bronchi Lungs Bronchioles CAIR Windpipe (trachea) Figure 2. Air sacs Figure 3. Other Organ Systems The circulatory system is one of the organ systems that make up an organism. It is made up of the heart, blood vessels, and blood. Figure 4 shows a model of a human heart. Your heart is about the size of your fist. It pumps and circulates blood to the different parts of the body through the blood vessels.​