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Part II: The lungs

The lungs are housed in a bony cage made up of the ribs, breastbone, and backbone. The floor of the cage is formed by a sheet of muscles called the diaphragm. When a person breathes in, the muscles of the diaphragm contract, pulling the diaphragm downward. At the same time, the ribcage is pulled up and out by the contraction of the muscles between the ribs, and air rushes in. When a person breathes out, the diaphragm and rib muscles relax and the chest subsides.

Respiration takes place 10 to 15 times a minute and is normally controlled unconsciously by a collection of cells in the brain called the respiratory center. After air has been breathed out, carbon dioxide builds up again in the bloodstream. The cells in the respiratory center are extremely sensitive to carbon dioxide concentrations. When the carbon dioxide in the blood reaches a certain level, messages are sent from the respiratory center to the diaphragm and rib muscles that trigger contraction. This once more initiates breathing in. as the lungs expand during inhalation, cells (stretch receptors) in the lung walls send signals back to the respiratory center. The center responds by instructing the muscles of the ribs and diaphragm to relax so that exhaling takes place.

Respiration is not always a quiet process. The presence of many dust particles in the nose can trigger sneezing. Irritants or too much mucus in the windpipe and bronchi cause coughing.

Part I

I. Practice the pronunciation and guess the meaning of the words

  1. respiratory

[rıs`pırətərı]

  1. respiration

[respə`reıʃn]

  1. carbon dioxide

[`ka:bən daı`ɔksaıd]

  1. oxygen

[`ɔksıʤən]

  1. mucus

[`mju:kəs]

  1. pharynx

[`færıŋks]

  1. larynx

[`lærıŋks]

  1. trachea

[trə`ki:ə]

  1. epiglottis

[epı`glɔtıs]

  1. bronchus

[`brɔŋkəs]

  1. bronchi (pl.)

[`brɔŋkaı]

  1. bronchiole

[`brɔŋkıəl]

  1. alveolus

[æl`vıələs]

  1. alveoli (pl.)

[æl`vıəlaı]

  1. capillary (ies)

[kə`pılərı]

  1. pulmonary

[`pʌlmənərı]

II. Memorize the vocabulary

  1. airsac

[`ɛəˏsæk]

  1. лёгочная сумка

  1. base

[`beıs]

  1. основа, основание

  1. to branch

[`bra:nʧ]

  1. разветвляться

  1. to breathe in / out

[`bri:ð]

  1. вдыхать / выдыхать

  1. carbon dioxide

[`ka:bən daı`ɔksaıd]

  1. углекислый газ

  1. cartilage

[`ka:tılıʤ]

  1. хрящ

  1. to choke

[`ʧɔuk]

  1. задыхаться

  1. cilium (pl. cilia)

[`sılıəm] (`sılıa:)

  1. ресничка, эпителия

  1. coarse

[`kɔ:s]

  1. грубый

  1. dust

[`dʌst]

  1. пыль

  1. entry

  • at the entry to

[`entrı]

  1. вход

  • у входа в

  1. flap

[`flæp]

  1. заслонка

  1. to mesh (with)

[`meʃ]

  1. оплетать чем-либо

  1. minute

[maı`nju:t]

  1. мелкий, мельчайший

  1. mucus

[`mju:kəs]

  1. слизь

  1. nostril

[`nɔstrıl]

  1. ноздря

  1. passage

[`pæsıʤ]

  1. проводящий путь

  1. particle

[`pa:tıkl]

  1. частица

  1. to prevent

[prı`vent]

  1. предотвращать

  1. projection

[prə`ʤekʃn]

  1. выступ

  1. redistribution

[ˏrıdıstrı`bju:ʃn]

  1. перераспределение

  1. to release

[rı`li:z]

  1. освобождать

  1. to split (into)

[`splıt]

  1. расщепляться

  1. sticky

[`stıkı]

  1. липкий, клейкий

  1. to stiffen

[`stıfn]

  1. делать жёстким

  1. tissue

[`tıʃju:]

  1. ткань

  1. to trap

[`træp]

  1. захватывать

  1. vapor

[`veıpə]

  1. испарение, пар

  1. voicebox

[`vɔısˏbɔks]

  1. голосовой аппарат

  1. windpipe

[`wındˏpaıp]

  1. дыхательное горло