well my friend it is quite easy to explain. The diaphragm is the section of our body that separates the Thorax from the Abdomen. There is a special hole in the diaphragm to let our food and etc. pass through. It is found that you are able to create a build up of air with your diaphragm which would help you to project your voice better. This doesn't mean that you have to have a good diaphragm to be a good actor but rather that it helps you a little more, unrecognizable by the human ear.
---Forgive me if my thesis is wrong as i am taking a very educated guess which could be wrong or write...its up to you to test it out, i am simply suggesting a reason---
When the diaphragm contracts the air is pushed out to the lungs and we breath. also when you project your voice you diaphragm rises causing you to take deeper breaths- this is why you breath more when you project your voice\sing etc
The diaphragm and the intercostals are muscles that help breathing. When you excerise they work harder because it is harder to breathe.
Help in breathing and separation of thoracic and abdominal cavities .
it doesnt.
Voice coaches and/or speech therapists can help with this.
When the diaphragm contracts the air is pushed out to the lungs and we breath. also when you project your voice you diaphragm rises causing you to take deeper breaths- this is why you breath more when you project your voice\sing etc
First, learn to use your diaphragm to speak instead of just your upper lungs. Breathe deep breaths and use that air to project with. You might try putting your hand on your diaphragm to be sure it's really doing the work.Next. try lowering the tone of your voice. A deeper voice automatically projects more, and many people speak in too high a tone and sound shrill and nasal.
Learning to sing does not change the quality of your voice, but will teach you how to speak louder and project by using your diaphragm.
In theater, projection helps because, without a microphone, the people in the last rows will not be able to hear you well, so in order for them to hear you better you project your voice using your diaphragm. This doesn't mean yelling or screaming out but to make your voice stronger and louder.
The larynx or voice box provides a passage. but the alveoli help
Using your diaphragm! It's the part of your stomach that jiggles when you laugh, and if you can talk from your diaphragm you can project as loud as you want.
If you harden your stomach it will help you to project your voice more
You do sing from your throat but it is mostly down to your diaphragm that is why you should stand up straight when singing to project your voice and sing out. if you slouch your unable to achieve what you could standing up.
it stops them from chocking up
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Breathe using your diaphragm. http://en.wikipedia.org/wiki/Diaphragmatic_breathing
Let your voice ring. Let it be heard, strong voice.