Contraction of the diaphragm reduces space in the rib cage and forces gases out of the lungs. As the diaphragm relaxes it increases the cavity size in the chest causing a drop in pressure, the decrease in pressure draws air in through the mouth or nose into the lungs. :)
Exhalation.Exhalation, as part of the respiratory system.
respiratory system
I think you mean the diaphragm, and that's part of the respiratory system. It's a muscle below the lungs, and when it tightens, it increases the volume of the cavity the lungs are in, so the lungs increase in volume as well, and air rushes into the lungs.
The respiratory system draws oxygen into the lungs. The circulatory system moves blood into the lungs to pick up the oxygen and then brings the oxygen to cells in the rest of the body.
By diffusion across q capillary wall
The respiratory system is the organ system that moves air into and out of your body.
the respiratory system
The circulatory system moves blood to the lungs. This part of the system is called the pulmonary circulation.
The respiratory system moves oxygen in and carbon dioxide (CO2) out.
the diaphragm tightens (moves down) expanding the lungs. This expansion creates the pressure in the lungs to decrease. Since nature always strives for equilibrium, high pressure moves to low pressure areas --> air fills the lungs. the diaphragm relaxes, moving back up in the chest cavity, increasing the pressure on the contents in the lungs. The air escapes the lungs to reach the lower pressure area outside our body.
The upper respiratory system (where air enters and exits the body) is composed of the nasal cavity, pharynx, and larynx. The lower respiratory system (where the air moves to be processed) consists of the trachea, the bronchi, and the lungs. So the answer is either the nose and mouth, or the trachea, depending on how you meant the question.
through respiratory membrane via diffusion