Shirazi sometimes consider themselves a separate ethnic group from the Swahili, but Swahili is their mother tongue. The famous elite Mazrui family of Mombasa are Shirazis. The Bajun, considered a separate ethnic group in the Kenya census, are also Swahili and sometimes call themselves Shirazi.
The mouth is the beginning of the digestive tract. In fact, digestion starts here as soon as you take the first bite of a meal. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.
How Lungs Work - A Little Gas Goes a Long Way. Very simply, the function of the lungs is to absorb oxygen, a gas that your body needs to function, and expel carbon dioxide, a waste gas that your body can't use (no, not that kind of waste gas!). But nothing is ever as simple as it sounds.