Question

which of the following actions involves voluntary muscle movement?
movement of food through the digestive tract
movement of blood through the blood vessels
beating of the heart
making of faces

Explanation:

Voluntary muscle movement is controlled consciously, while involuntary is automatic. Movement of food (peristalsis), blood (circulation), and heart beating are involuntary (smooth/cardiac muscles). Making faces uses skeletal muscles, controlled voluntarily.

Answer:

D. making of faces