A student builds a model of the heart and brain, shown in the diagram. Two trucks, 1 and 2, travel between the organs. The student will label the trucks with what they are carrying.
Which set of labels BEST completes the model?
Responses
A Truck 1 carries oxygen and Truck 2 carries carbon dioxide.Truck 1 carries oxygen and Truck 2 carries carbon dioxide.
B Truck 1 carries carbon dioxide and Truck 2 carries oxygen.Truck 1 carries carbon dioxide and Truck 2 carries oxygen.
C Truck 1 carries red blood cells and Truck 2 carries white blood cells.Truck 1 carries red blood cells and Truck 2 carries white blood cells.
D Truck 1 carries white blood cells and Truck 2 carries red blood cells.
The question seems to describe a model demonstrating the circulatory connection between the heart and brain and the transport of gases by the blood.
In the cardiovascular system, the heart pumps oxygenated blood to the brain (and the rest of the body) and receives deoxygenated blood that contains carbon dioxide from the brain (and the rest of the body) to be sent to the lungs for gas exchange.
Thus, based on this concept:
- Truck 1 should be carrying oxygenated blood to the brain, which in the context of the simplified model means Truck 1 would be carrying "oxygen" to the brain.
- Truck 2 should be carrying deoxygenated blood away from the brain, which means Truck 2 would be carrying "carbon dioxide" back to the heart (and then to the lungs for oxygenation).
Therefore, based on this understanding, the best set of labels to complete the model would be:
A Truck 1 carries oxygen and Truck 2 carries carbon dioxide.