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What is the primary muscle used for normal breathing and which additional muscles are used to increase inspiration and expiration when performing strenuous exercise?
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What is the primary muscle used for normal breathing and which additional muscles are used to increase inspiration and expiration when performing strenuous exercise?

User JoyGuru
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Answer:

rat rat

Step-by-step explanation:

rat rat rat

User Subodh Nijsure
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The primary muscle used for normal breathing would be the lungs. Addition muscles used would be the diaprahm.
User Vimzy
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