Pals can even watch your journey on a map in real-time, using the Uber app. After booking a ride, the app sends riders a photo of their driver, his license plate number and a description of the vehicle, so they know who to look for.berX drivers are required to be at least 21 or 23 years old, depending on the city, have their own insurance and a mid-size or full-size 4-door vehicle in excellent condition, according to Uberâs website.
When you inhale air through your nose or mouth, it travels down the back of your throat (pharynx), passes through your voice box (larynx) and into your windpipe (trachea). Your trachea is divided into two air passages (bronchial tubes). One bronchial tube leads to the left lung, the other to the right lung.
As the bronchial tubes pass through the lungs, they divide into smaller air passages called bronchioles. The bronchioles end in tiny balloon-like air sacs called alveoli. Your body has over 300 million alveoli. The alveoli are surrounded by a mesh of tiny blood vessels called capillaries. Here, oxygen from the inhaled air passes through the alveoli walls and into the blood. After absorbing oxygen, the blood leaves the lungs and is carried to your heart. Your heart then pumps it through your body to provide oxygen to the cells of your tissues and organs.