AP BIOLOGY

Detailed explanation-1: -When you breathe, air travels to your lungs through airways called bronchi. The bronchi divide into smaller airways, called bronchioles, which end in clusters of tiny air sacs, called alveoli.

Detailed explanation-2: -As it moves through blood vessels (capillaries) in the alveoli walls, your blood takes the oxygen from the alveoli and gives off carbon dioxide to the alveoli. These tiny alveoli structures, taken together, form a very large surface area to do the work of your breathing when you’re resting and exercising.

Detailed explanation-3: -Explanation: The spherical or grape-like shape of the alveoli allows for maximum contact between the alveoli and the capillaries that surround them.

Detailed explanation-4: -When you inhale through your nose or mouth, air travels down your pharynx (back of your throat), passes through your larynx (voice box) and into your trachea (windpipe). Your trachea is divided into two air passages called bronchial tubes. One bronchial tube leads to your left lung, the other to your right lung.