Air enters the body through the nose or mouth and travels down the trachea. From there, it enters the bronchial tubes in the lungs, which branch into smaller airways called bronchioles. Finally, oxygen is exchanged with carbon dioxide in the alveoli, tiny air sacs in the lungs where oxygen is absorbed into the bloodstream.
When we inhale, the air enters our lungs where oxygen is absorbed into the bloodstream and carbon dioxide is released. This process allows the inhaled air to have a higher oxygen content compared to exhaled air, which now contains more carbon dioxide.
The respiratory system does this by the mucous membranes and cilia in the nose and nasal cavity. The air is warmed and moistened as it passes through the nasal passages, and dust particles are filtered out by the sticky mucus and tiny hairs (cilia) in the respiratory tract.
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The air first enters into the nasal cavity (or mouth) then to the pharynx. Air is warmed by the nasal passages. From there, it passes through the trachea, then to the main bronchi (2, plural is bronchi; 1 is bronchus), and begins its descent into numerous bronchioles in the lungs. Within the lungs, the structures look like an upside down tree, wider at the top (the bronchi, which is like a split trunk of a tree), and getting increasingly narrower in the bronchioles (similar to branches on a tree being wider then getting narrower as the branches reach upward on a tree). At the ends of each bronchiole, there are clumps of aveoli which look like a clump of grapes. The aveloi round balls (just one is an aveolus) have a thin membrane which has many small blood vessels over and around each one. Here, the air we breathe passes into the bloodstream as oxygen. At the same time, carbon dioxide is released from the bloodstream to the aveloi, which expel it into the bronchioles, up though the lungs to the main bronchi, up the trachea, and back up to and out either the nose or the mouth.
The mouth and the nose is where air comes in.
Two air passages which allow air to enter the body are the cilia and aveoli !!!
Mouth and nose
Air can enter the body by the mouth or the nose. Air then goes down the windpipe to the lungs where it can enter the bloodstream.
the air enters the bronchioles, and into the aveoli, which are small, one cell-thick sacks of air. These sacks are surrounded by tiny capillaries, which is how your blood retrieves its oxygen. From here, the oxygenated blood is carried back to the heart through the pulmonary vein and pumped into your body.
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Air enters the body through the nose or mouth and travels down the trachea. From there, it enters the bronchial tubes in the lungs, which branch into smaller airways called bronchioles. Finally, oxygen is exchanged with carbon dioxide in the alveoli, tiny air sacs in the lungs where oxygen is absorbed into the bloodstream.
When you breathe in through your nose, oxygen along with other gases enter the windpipe and travel to the lungs. In the lungs, oxygen is absorbed into the bloodstream while other gases are exhaled out of the body.
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