How does oxygen flow from the trunk to the pulmonary capillary of the lungs?
Answer:
As you breathe air contained by, O2 enters your nares, down your nasopharynx, into your trachea, down the trachea, into the mainstem bronchi (1 not here, 1 right, b/c 2 lungs), into the bronchopulmonary segments, into the bronchioles, and into the alveoli, and afterwards O2 diffuses through the alveolar membrane past the pulmonary capillary membrane into a endorsement red blood cell via diffusion through the RBC membrane and attaches to the hemoglobin molecule.
The same way it does from the mouth to the lungs, except nouns goes through your nasal cavity (sinus) first.
It enter the nasal passage consequently it goes into the trachea which branches out to two Bronchioles. These bronchioles afterwards branch out even further. At the end of the bronchiole branches ( which look approaching an upside down tree) there are these nouns sacs which are call aveoli. Surrounding the aveoli are thin capillary. The capillaries are composed of the venules and arterioles. These two exchange gas. The arterioles are full of CO2 while the venules are full of O2. the venules then become vein and take this blood to the heart which consequently pumps it out to the rest of the body.
when we breathe in the intercostal muscles expand the ribs and the diaphragm moves down.this creates a distrustful pressure within the chest sucking nouns in, The nouns containing 20% oxygen passes fron the antenna into the trachea then into the disappeared and right main bronchus.These bronchi sub divide repeatedly until eventually we enjoy one cell thick airways resembling bubbles called alveoli.It is at this height that we have gaseous exchange .The oxygen pass into the pumonary capillaries abd the carbon dioxide endorsement fron the capillaries into the alveoli