The Organs of Respiration include the lungs and the air passages resulting in them. The lungs are two in number, and occupy the pleural chamber of the thorax, one on each facet of the median line, being separated from one another by the guts, the better blood-vessels and the bigger air tubes. Each lung is free in all directions, except at the foundation, which consists mainly of the bronchi, arteries and veins connecting the lungs with the trachea and heart. The lungs are spongy and porous, and their tissues are very elastic. They are lined with a delicately constructed however robust sac, known because the pleural sac, one wall of which carefully adheres to the lung, and the opposite to the inner wall of the chest, and which secretes a fluid which permits the interior surfaces of the walls to glide simply upon each other within the act of breathing. The Air Passages include the inside of the nostril, pharynx, larynx, windpipe or trachea, and the bronchial tubes.

When we breathe, we draw in the air by means of the nostril, by which it's warmed by contact with the mucous membrane, which is richly supplied with blood, and after it has handed through the pharynx and larynx it passes into the trachea or windpipe, which subdivides into numerous tubes referred to as the bronchial tubes (bronchia), which, in flip, subdivide into and terminate in minute subdivisions in all of the small air areas within the lungs, of which the lung's comprise tens of millions. A writer has acknowledged that if the air cells of the lungs had been unfold out over an unbroken floor, they might cover an area of fourteen thousand square ft. The air is drawn into the lungs by the motion of the diaphragm, a great, strong, flat, sheet-like muscle, stretched throughout the chest, separating the chest-box from the abdomen. The diaphragm's action is sort of as computerized as that of the heart, although it could also be transformed into a semi-voluntary muscle by an effort of the will.

When it expands, BloodVitals device it will increase the size of the chest and lungs, and the air rushes into the vacuum thus created. When it relaxes the chest and lungs contract and the air is expelled from the lungs. Now, before contemplating what occurs to the air in the lungs, allow us to look a little bit into the matter of the circulation of the blood. The blood, as you recognize, is pushed by the center, by the arteries, into the capillaries, thus reaching every a part of the body, which it vitalizes, nourishes and strengthens. It then returns by way of the capillaries by another route, the veins, to the center, from whence it is drawn to the lungs. The blood begins on its arterial journey, BloodVitals device bright crimson and rich, laden with life-giving qualities and properties. It returns by the venous route, poor, blue and dull, being laden down with the waste matter of the system. It goes out like a contemporary stream from the mountains; it returns as a stream of sewer water.

This foul stream goes to the precise auricle of the guts. When this auricle becomes crammed, it contracts and forces the stream of blood by way of an opening in the appropriate ventricle of the guts, which in turn sends it on to the lungs, the place it's distributed by tens of millions of hair-like blood vessels to the air cells of the lungs, of which we've got spoken. Now, allow us to take up the story of the lungs at this point. The foul stream of blood is now distributed among the thousands and thousands of tiny air cells in the lungs. A breath of air is inhaled and the oxygen of the air comes involved with the impure blood by means of the skinny partitions of the hair-like blood vessels of the lungs, which walls are thick enough to hold the blood, however skinny sufficient to admit the oxygen to penetrate them. When the oxygen comes involved with the blood, a form of combustion takes place, and the blood takes up oxygen and releases carbonic acid gas generated from the waste products and poisonous matter which has been gathered up by the blood from all parts of the system.

The blood thus purified and oxygenated is carried again to the center, again wealthy, pink and bright, and laden with life-giving properties and qualities. Upon reaching the left auricle of the guts, it's pressured into the left ventricle, from whence it is again compelled out through the arteries on its mission of life to all elements of the system. It is estimated that in a single day of twenty-four hours, 35,000 pints of blood traverse the capillaries of the lungs, the blood corpuscles passing in single file and being uncovered to the oxygen of the air on both of their surfaces. When one considers the minute details of the method alluded to, he is misplaced in wonder and admiration at Nature's infinite care and intelligence. Will probably be seen that unless fresh air in adequate quantities reaches the lungs, the foul stream of venous blood can't be purified, and consequently not solely is the body thus robbed of nourishment, however the waste products which ought to have been destroyed are returned to the circulation and poison the system, and loss of life ensues.