Standard Science Primary 5 Systems

Why does the heart beat faster during exercise?

A To pump more oxygen and nutrients to the muscles.
B To produce more carbon dioxide for the body.
C To help the body cool down faster.
D To take in more air into the lungs.
Show Worked Solution

Worked Solution

Step 1: Muscles need more energy during exercise. Step 2: Energy is produced by respiration, which requires oxygen and sugar. Step 3: The heart beats faster to deliver these substances via the blood more quickly.

Correct answer: To pump more oxygen and nutrients to the muscles.

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

Start Free Trial — 7 Days Free