How do people breathe?

Answer 1

People breathe through their lungs using their respiratory system.

Inhalation occurs when the diaphragm (a muscle under the lungs) pushes down on internal organs, freeing up space for the lungs to expand. The intercostal muscles between ribs also elevate the rib cage and push it out. The expansion creates negative pressure in the lungs, and the higher pressure of the atmosphere draws air into the lungs. The oxygen diffuses into the blood running through the capillaries around the alveoli, sacs that line the lungs. Carbon dioxide also moves to a lower concentration to the interior of the lungs from the blood.

Exhalation is essentially the opposite process: the diaphragm and ribs relax, creating positive pressure within the lungs and pushing the carbon dioxide out. The actions of the diaphragm and other muscles is controlled in the areas of the brain, not conscious thought, which makes breathing while sleeping possible.

when you breathe in your diaphgram flatens as your lungs expand.when you breathe out your diaphgram relaxes and takes a dome shape and your lungs collapses.

By flexing the diaphragm below the lungs. This creates a vacuum to suck air in and then pushes the air back out. A popular illustration of how this works is to put a deflated balloon in a 2 liter bottle with the bottom cut off. Hang it so that the balloon is inside but the neck of the ballon is stretched over the opening. Then take plastic wrap or a sheet of rubber the fasten it to the bottom, make sure it isn't stretched tightly, there needs to be some give, and make sure that the excess is in the bottle. Once it is airtight, pull down on the plastic wrap. This makes the space inside the bottle larger, but no extra air can get in to fill it. So, the balloon inflates to take up the new space. Now, push the plastic back up into the bottle. There isn't enough room anymore for all the air. So, the air in the ballon is expelled. Hope this helps!

It is an involuntary motion control by the cerebelum which is dorsal to the brain. It consisit of abdomen movements to put air into the lungs and to empty it.
the diaphram ,which is a muscle under the lungs, contracts and pulls the lungs down, expanding them and filling them with air, we only realise the air when we relax this muscle, if you realse the musle to quickly you can often damage the tissue, hence we breath in and out at a steady pace.

the oxygen is passed through the pharynx and larynx which pass into the trachea and it branches into the bronchi through the lungs and back up in reverse.
With lungs! Without lungs there would be no place for the air to go.