Question

1. blood traveling from the lungs is ____, and blood traveling to the lungs is

a. nitrogen - rich, nitrogen - poor
b. deoxygenated, oxygenated
c. oxygenated, deoxygenated
d. high - pressure, low - pressure

Explanation:

To solve this, we recall the process of gas exchange in the lungs. Blood travels to the lungs (from the heart's right side) as deoxygenated blood (low in oxygen, high in carbon dioxide) to pick up oxygen. After gas exchange in the lungs, blood leaving the lungs is oxygenated (high in oxygen, low in carbon dioxide). So blood from the lungs is oxygenated, and blood to the lungs is deoxygenated. Option a is incorrect as nitrogen is not the main gas exchanged. Option b reverses the terms. Option d is incorrect as pressure isn't the main distinction here for this context.

Answer:

c. Oxygenated, deoxygenated