SO Second Timers: DD-1 (A-D)

Many speakers that we use for CD’s and cassettes vibrate pieces of plastic to make voices and music. You can take a speaker apart and see this plastic.

We vibrate vocal cords of skin to speak. These are located near the top of our throat in the Adam’s apple.

Birds use their syrinx to make sound vibrations.

Two air tunnels in birds come upward from the birds single-air sack lungs.

These tube-tunnels which come from the bird’s lungs have skin-like membranes in them that muscles move in and out of the air flow so they’ll fold.

Sometimes there is something like a balloon attached to the heart in a bird’s chest which make sounds like the honking of geese.

Oftentimes these skin membranes in the “air tunnels” (bronchi) of birds are attached to super-slow muscles–the slowest on earth.

These super-slow muscles in the syrinx of birds are also used for a rattlesnake’s rattle shaking.

Super-speed muscles make it so birds can make bird songs that have very fast note changes.

Some birds can sing as many notes as there are on a harmonica in a single second!