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Updated: May 2, 2025
He quotes several authorities as showing that during muscle work the carbon dioxid of the blood is increased in amount, which, stimulating the nervous centers controlling the suprarenal glands, increases the epinephrin content of the blood. The consequence is contraction of the splanchnic blood vessels, with a rise in general blood pressure.
The oxygen from the water and part of that from the carbon dioxid is given off into the air through the breathing pores, while the carbon, hydrogen, and part of the oxygen, unite to form the carbohydrates.
In a similar manner two gases, especially if of different densities, may mingle even when separated from each other by a membrane. In a general way this explains the respiratory changes that occur in the blood in the lungs. Blood containing oxygen and carbon dioxid is flowing in countless tiny streams through the walls of the air cells of the lungs.
What are the lungs giving off in the breath besides carbon dioxid? How can you prove this? 5. How can you prove that the gas in your breath is not like the gas in the fresh air around you? 6. Why does a room with people in it grow very warm if the doors and windows are kept closed? 7. How does Nature keep the outdoor air clean? What makes the winds? 8.
Some sand soils, particularly residual sands, which often consist largely of quartz-silicon dioxid are very deficient in potassium; consequently the experiments or demonstrations conducted by the potash syndicate at Southern Pines, North Carolina, show very marked increases from the use of potassium salts on such soil, although the result ought not to be used to encourage the use of such fertilizers on normal soils, which are exceedingly rich in potassium.
When the yeast plant is set to work in a tub or vat of grape juice, it attacks the fruit sugar contained in the juice, and splits it up into alcohol and carbon dioxid, so that the juice becomes bubbly and frothy from the gas. When from seven to fifteen per cent of alcohol has been produced, the liquid is called wine. Beer, Ale, and Cider.
The word is now commonly used to mean suspended animation. When for any reason the proper supply of oxygen is cut off, the tissues rapidly load up with carbon dioxid. The blood turns dark, and does not circulate. The healthy red or pink look of the lips and finger-nails becomes a dusky purple. The person is suffering from a lack of oxygen; that is, from asphyxia, or suffocation.
It does not carry oxygen or collect the carbon dioxid as does the blood of higher animals. That work, as we have just seen, is done by the air-tubes. Above the alimentary canal, extending almost the whole length of the abdomen and thorax, is a thin-walled pulsating vessel, the heart.
The blood is thus supplied with a much larger amount of oxygen from the air inhaled, and gives off to the air a corresponding excess of carbon dioxid and water. Again, exercise stimulates and strengthens the organs of digestion. The appetite is improved, as is especially noted after exercise in the open air.
If the yeast germ be set to work in a pulp or mash of crushed barley or wheat, the starch of which has been partly turned into sugar by malting, it breaks up the sugar into alcohol and carbon dioxid.
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