Question

When Jacob starts running, his legs move faster and his heart rate increases. Which types of muscles are involved in these changes?

Answer 1

THE BICEPS AND TRICEPS ARE INVOLVED IN THIS...

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Answer 2

Explanation:

his muscles of legs(quadriceps femoris,rectus Femoris etc are involved) helped him alot to move fast.

but for these changes ADRENALIN HORMONE is responsible for increased heart rate.

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