Standard Science Primary 5 Systems

Which of the following correctly describes the blood flowing from the lungs to the heart?

A Rich in oxygen and rich in carbon dioxide
B Poor in oxygen and rich in carbon dioxide
C Rich in oxygen and poor in carbon dioxide
D Poor in oxygen and poor in carbon dioxide
Show Worked Solution

Worked Solution

Step 1: In the lungs, gaseous exchange occurs. Step 2: Oxygen enters the blood and carbon dioxide leaves the blood. Step 3: Therefore, blood returning to the heart from the lungs is oxygenated (rich in oxygen).

Correct answer: Rich in oxygen and poor in carbon dioxide

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free