EMBRYOLOGY
RESPIRATORY SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
When we breathe OUT, our diaphragm rises. The lungs ____, and the space inside becomes smaller. So, air is forced out of the lungs, through the windpipe and out of the nose.
|
|
expand
|
|
|
contract
|
|
|
reflect
|
|
|
None of the above
|
Explanation:
Detailed explanation-1: -When you breathe in, your diaphragm contracts (tightens) and flattens, moving down towards your abdomen. This movement creates a vacuum in your chest, allowing your chest to expand (get bigger) and pull in air. When you breathe out, your diaphragm relaxes and curves back up as your lungs push the air out.
Detailed explanation-2: -When you breathe in (inhale), air containing oxygen enters your windpipe, passes through the bronchi and eventually reaches the air sacs. These air sacs, called alveoli, are responsible for gas exchange. They look a bit like grapes at the end of the bronchial branches.
There is 1 question to complete.