Which of the following actions involves voluntary muscle movement? a) movement of food through the digestive tract b) movement of blood through the blood vessels c) beating of the heart d) making of faces.

Option D

Explanation: The voluntary muscle movement can be defined as the muscle movement that works according to our will. This can be controlled by us. Example: movement of hand, movement of the legs are under our control. Like this the making of faces is also under our control.

Involuntary muscle movement can be defined as the movement of the muscles that is not under our control. Example: beating of heart, movement of food through digestive track and movement of blood through blood vessels.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

explanation:

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