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

Acommon technique in analysis of scientific data is normalization. the purpose of normalizing data is to eliminate irrelevant constants that can obscure the salient features of the data. the goal of this experiment is to test the hypothesis that the flux of light decreases as the square of the distance from the source. in this case, the absolute value of the voltage measured by the photometer is irrelevant; only the relative value conveys useful information. suppose that in part 2.2.2 of the experiment, students obtain a signal value of 162 mv at a distance of 4 cm and a value of 86 mv at a distance of 5.7 cm. normalize the students' data to the value obtained at 4 cm. (divide the signal value by 162.) then calculate the theoretically expected (normalized) value at 5.7 cm.