Question

2
select the correct answer.
how does regular exercise help make us more alert and energetic?
a. it gets our hearts beating faster and gives us a rush of energy.
b. exercise increases our endurance and therefore we feel less tired.
c. during exercise the brain releases endorphins, the chemicals that help improve our mood,
d. we breathe in more oxygen while exercising, which helps us feel more awake.
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Explanation:

To determine the correct answer, we analyze each option:

• Option A: A temporary heart rate increase and energy rush isn't the main long - term way exercise makes us alert/energetic.
• Option B: While exercise can increase endurance, this doesn't directly explain increased alertness and energy in the context of how exercise works physiologically to make us feel more alert and energetic.
• Option C: Endorphins released during exercise are mainly for pain relief and mood improvement, not directly for alertness and energy.
• Option D: When we exercise, our breathing rate increases, allowing us to take in more oxygen. Oxygen is essential for cellular respiration in the brain and other tissues. More oxygen means more energy production and better brain function, which makes us feel more awake and energetic.

Answer:

D. We breathe in more oxygen while exercising, which helps us feel more awake.