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A Handbook of Health by Woods Hutchinson

Entered by the bronchi with their bronchial tubes


Heart.

A muscle-sac located in the thorax between the lungs, its lower point, or a'pex, being tilted somewhat to the left; the centre and force-pump of the circulatory system.

Ox i da'tion. Combining with oxygen.

Ox'y gen. A colorless, odorless, tasteless gas, which forms about one-fifth of the earth's atmosphere. It is found in all animal and vegetable tissues. When it combines with other substances, a certain amount of heat is produced; and if the process is sufficiently rapid, a flame is seen.

Pulse. The regularly recurring enlargement of an artery, caused by the increased blood flow following each contraction of the ventricle of the heart.

Veins. The blood vessels and their branches through which blood flows from all parts of the body back to the heart. All the veins except the pulmonary veins carry impure (venous) blood; the pulmonary veins carry arterialized (oxidated) blood from the lungs. Ve'na ca'va. Either of the two large veins discharging into the right auricle of the heart. Por'tal vein. The large, short vein that drains the liver and adjacent parts.

Ven'tri cles. The two chambers of the heart that receive blood from the auricles and force it into the arteries.

V. RELATING TO THE RESPIRATORY SYSTEM AND ORGANS OF EXCRETION

Al ve'o

li ([)a]l v[=e]'o l[=i]). (Plural of _alveolus_). Air cells. The cells, or cavities, that line the air passages and air sacs at the ends of the bronchial tubes.

Breath. Air taken in or sent out in respiration; that breathed out containing carbon dioxid, watery vapor, and various impurities.

Bron'chi (br[)o]n'k[=i]). (Plural of _bronchus_). The two main branches of the trachea. These branch into numerous smaller branches, called the bron'chi al tubes.

Car'bon di ox'id. A gas formed of carbon and oxygen; colorless and odorless; has a somewhat acid taste, and is used for aerating soda water and other beverages; is present naturally in mineral and spring waters. It is present largely in the fissures of the earth and makes the choke-damp of mines. Called also car bon'ic acid.

Ep i glot'tis. The valve-like cover that prevents food and drink from entering the larynx.

Ex cre'tion. A waste substance thrown out, or rejected, from the system; for example, carbon dioxid, sweat, ur'ine, the fe'ces.

Lar'ynx. The enlargement of the windpipe, near its upper end, across which are stretched the vocal cords.

Lungs. Two spongy organs in the thorax, entered by the bronchi with their bronchial tubes; they contain in the walls of their air cells the capillaries through which the blood passes from the branches of the pulmonary artery to the branches of the pulmonary veins.

Rec'tum. The lowest and last section of the alimentary canal, being the discharge pipe of the large intestine, and excreting the solid wastes in the form of the feces.


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