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What happens to cause air to be exhaled from the lungs?
the diaphragm relaxes and that causes the ribcage to compress (get smaller) this pushes air out, and you have exhailed
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Pulmonary Function Test (PFT)
Your diaphragm expands, your rib cage goes up, and your lungs also expand. I learned this in science.
The air you exhale normally contains 19% less oxygen than inhaled air, with a 4% to 5% level of carbon dioxide and other gases, along with added water vapor. (Which is why you… can rebreathe it to control "hiccups".) Your body will continue to remove the remaining oxygen and add more carbon dioxide until the exhaled air is almost all nitrogen and CO2. So if you had only this air to breathe, your body would not be able to keep functioning and you could pass out and eventually die. This is the same situation as when one or more persons are trapped in a closed space with a limited amount of air. The considerable oxygen content (17%) in exhaled air allows mouth-to-mouth resuscitation in CPR.
So the blood can be oxygenated
Air rushes in with chest expansion by moving the muscles of the chest and the diaphragm this creates a lowered pressure with that causes the lungs to inflate.
When you breathe in, the air moves into the lungs through the trachea or the windpipe. The trachea branches out into two bronchi, the main airway that reach into each lung.
Your diaphragm is the muscle that helps air move in and out of your body. It is a muscle below your lungs, contracting and relaxing as you breathe. When inhaling, the diaphrag…m contracts and moves down, causing the volume of your chest cavity to increase with air. This causes air pressure to reduce in the chest cavity, thus causing air pressure outside the body to increase and force itself into your air passage ways and into your lungs.
Exhalation occurs when the diaphragm relaxes.
When you breathe out, or exhale, your diaphragm relaxes and moves upward into the chest cavity. The intercostal muscles between the ribs also relax to reduce the space in the …chest cavity. This is done because the lungs become smaller
The diaphragm, below the lungs, contracts causing a lower pressure in the lungs, and pulls the air in. To exhale, the diaphragm relaxes, and the chest muscles contract, forci…ng the lungs to be smaller and the air to be pushed out. While having sex, this happens faster as we need more energy. ah! ah! ah! oh! oh!oh!
When this happens, your lungs and the rib cage (with muscles between each rib) expand when inhaling, and return to their previous size.
The air inside our lungs moves in and out because of the movement of the diaphragm as well as the ribs and chest cavity. When we breath in our ribs push out and our diaphragm …contracts to create a larger cavity inside your lungs. This causes an area of low pressure which therefore forces air down our trachea into our lungs. When we breath out the opposite happens (diaphragm relaxes and ribs pull in) which creates a smaller cavity in our lungs what therefore forces the air out of our lungs once respiration has taken place. It should be noted that during inspiration as the intercostal muscles expand the rib cage and the diaphragm (more important for volume change) moves inferiorly, this creates negative pressure in the thoracic cavity relative to the atmospheric pressure.. consequently due to the pressure gradient, air can move into the lungs via the trachea. The negative pressure that is caused here is the main propellent of air. Whereas expiration, when the diaphragm and intercostal muscles return to resting position, thus restoring pressure to its normal levels is a passive process. The pressure gradient returns to normal and air can be expired. The importance of the negative pressure created by the intrapleural cavity cannot be stressed enough.
I believe that the pressure from the diaphragm causes our lungs inflate, thus we inhale and when the diaphragm deflates, it makes us exhale. -------------------------------…-------------------------------------- As your diaphragm or intercoastal muscles contract the size of the lungs increases. This creates a pressure difference between your lungs and the surrounding atmosphere. By increasing the size of the lungs you create a low pressure environment in the lungs by expanding the same amount of gas to a larger area. this pressure difference doesn't have to be much 1mmhg is more then enough, the main thing is just that you need a difference in preasure. Air flows from high preasure to low preasure, so by decreasing the preasure in the lungs air flows into the lungs. as you breath out you make the lungs smaller by relaxing the muscles and diaphragm, making the volume in the lungs decrease, thus increasing the preasure and moving the air from inside the lungs out to the surrounding atmosphere.
Breathing causes the lungs to fill with air. The negative pressure draws air into the lungs for the survival of the organism.
when you inhale your lungs expand when you exhale they deflate because the air leaves the lungs.