When Jacob starts running, his legs move faster and his heart rate increases. Which types of muscles are involved in these changes?
A.) Skeletal muscles control his leg movement and smooth muscles control his heart rate.
B.) Skeletal muscles control his leg movement and cardiac muscles control his heart rate.
C.) Smooth muscles control his leg movement and cardiac muscles control his heart rate.
D.) Skeletal muscles control both his leg movement and heart rate.
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