voluntary, you cause your lips to form the shape to whistle, and cause the air to be pushed out. if whistling were involuntary, you would do it without making an effort (like your heart pumping, digesting things, etc)
the african booty scracher
Your brain.
Blood coursing through the ear or eardrum
bad wheel hub cap
Something that causes an involuntary action
tardive dyskinesia
whistling noise from engine will be caused by a leaky gasket,sucking air. this is usually the intake manifold gasket
natural reactions
It is caused by involuntary muscle contractions.
it is a problem in the nervous system
Gmtjh