Research - How is sound produced

http://edu.kbyyed.go.kr/newboard/BList.asp?Flag=View&TId=yy_edu3&Page=1&BNo=3&sWord=&ss=0&sc=0&sn=0&BRef=3

Here is one interesting video that covers how the sound is produced. It is kinda ironical that a lot of people are unaware of how their voice is produced, when they talk everyday (and this includes me also).
After watching this video and wandering many different websites, I finally realized how the voice is made inside our neck.

Okay, so here is a nice digram of our vocal chord. I don't know all these vocabularies that are in the diagram, but at this point, those retain no importance. All I needed to focus on was two thick lines that are surrounding Trachea, in the middle of the picture. Those are called vocal fold and they have the most important role in making voices. When you are just staying still, not saying anything, the vocal folds are closed, and stuck together. But when you say something, the vocal folds open up and vibrate to make different pitches of sounds. This is how the voice is created. However, it is a little bit different when you are trying to sing. In order to sing, the first thing you do is inhale deeply. The air passes through vocal chords and when you make sounds you exhale the air you just breathed in with a pressure. During that process, vocal folds open up and then you are singing.

But in the video, i found something very interesting. There were multiple demos that a guy went through and in one of them, there was a woman singing relatively high notes. While she was singing, the vocal folds became closer and ended up touching each other. At that instance, she cracked her voice and made an unplesant sound. I thought that's what i was going through every day. I knew that i needed to breath more and deeper but I didn't know why i needed to do that. But the video showed me that i should, in order to keep the vocal folds moving so that it doesn't close.

Well, it turned out that researching is actually quite helpful. I'm discovering so many things that i didn't know before about singing, and the fact is that i still don't know about 99% of the information there is... which might be a good thing, and a 'bad' thing (too much work!)