RESPIRATORY SYSTEM. English

RESPIRATORY SYSTEM

C.E.I.P. Santa Ana (Madridejos)

BREATHING: It’s one of the nutrition functions. Breathing is the process that moves air in and out of the lungs.

Breathing is also the process that delivers oxygen to cells in the body and removes carbon dioxide from them.

1.- RESPIRATORY SYSTEM: Our respiratory system includes the lungs, and some tubes ( airways) that connect them with the mouth and nose.

.- The airways or respiratory tract: It is formed by nasal cavity, the pharynx, the larynx, the trachea, the bronchial tubes.

In the lungs these tubes divide into smaller and smaller ones called the bronchioles with end in small sacks called alveoli. .- The lungs: The lungs have a spongy and soft texture. The lungs are the essential respiration organs in many animals. They are helped by a breathing muscle called the diaphragm. Their principal function is to transport oxygen from the atmosphere into the bloodstream, and to release carbon dioxide from the blood into the atmosphere. This exchange of gases is in thinwalled air sacs called alveoli.

RESPIRATORY SYSTEM

C.E.I.P. Santa Ana (Madridejos)

2.- BREATHING IN LUNGS: Breathing has two steps: .- Inhalation (or inspiration): is the movement of the diaphragm and more muscles that produces the air from the external environment get into the alveoli (through the air ways). The air enters due to the contraction of the diaphragm, inflating the lungs.

The oxygen from the air passes into the blood, which delivers the oxygen to the every cell in the body. And the carbon dioxide from the blood goes into the alveoli. .- Exhalation (or expiration): the diaphragm relaxes and the air rich in carbon dioxide passes from the blood to the air in the alveoli, and it’s expelled through the respiratory tract.

GAS EXCHANGE IN ALVEOLI

3.- GAS EXCHANGE IN CELLS. The blood rich in oxygen goes to every tissue cell in the body through the arteries and capillaries, it gives oxygen to the cells and catch the carbon dioxide and take it to the heart and later to the lungs and the exterior environment.