Which describes the role of the muscular system during physical activity? Select all that apply.
1: It allows for movement.
2: It controls the breathing rate.
3: It forces venous blood to return to the heart.
4: It controls the heart rate.

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

Anybody wanna ? (picture included? )

Drag each tile to the correct box. tiles bra i sequence