Standard Science Primary 5 Systems

How do the respiratory and circulatory systems work together?

A The circulatory system digests food and the respiratory system absorbs it.
B The circulatory system takes in carbon dioxide from the air.
C The respiratory system pumps blood to the lungs.
D The respiratory system takes in oxygen, and the circulatory system transports it to the body.
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Worked Solution

Step 1: The respiratory system (lungs) exchanges gases with the environment, taking in oxygen. Step 2: Oxygen diffuses into the blood in the lungs. Step 3: The circulatory system (heart and blood vessels) pumps this oxygen-rich blood to all parts of the body.

Correct answer: The respiratory system takes in oxygen, and the circulatory system transports it to the body.

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