Standard Science Primary 5 Systems

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

A Rich in oxygen, poor in carbon dioxide
B Rich in carbon dioxide, poor in oxygen
C Rich in digested food, poor in oxygen
D Rich in waste materials, rich in oxygen
Show Worked Solution

Worked Solution

Step 1: Lungs are where gaseous exchange occurs. Step 2: Carbon dioxide is released, and oxygen is absorbed. Step 3: Blood returning from the lungs is freshly oxygenated.

Correct answer: Rich in oxygen, 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