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Q. Does the moon have a dark side?
A. The moon does have a far side which is impossible to see from the earth, but it doesn't mean that it's always dark. Each side of the moon is dark for no longer than 15 days at a time.
Q. Where does sound come from?
A. The air is always filled with sound waves. All things give off vibrations, but some have a low frequency which most cannot hear. The reason: it may take 3 minutes to make a single vibration. They may be caused by earthquakes and storms.
Did You Know?
The microwave was invented after a researcher walked by a radar tube and a chocolate bar melted in his pocket.
Coke-a-Cola was originally green.
Rubberbands last longer when refrigerated.
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Nature of Respiration
by Jeanette Cain
Animals move oxygen through their body systems and then release carbon dioxide to the outside of their body in a process called respiration.
The energy needed to generate energy in many-celled animals is accomplished through the process of aerobic respiration. This process requires the use of oxygen, which then produces carbon dioxide in the ongoing process of respiration.
Whether living in deep, or shallow waters, underground dens, or nests, mountains, or lowlands, animals are in a continuous state of respiration. Animals may have different ways of pulling in oxygen, but each must meet the needs of maintaining stability of the respiration system for the animal to survive.
The interaction between the respiratory system and other body organs of the complex animals follows this route:
1. Water and food intake goes to the digestive system. From the digestive system, there is an elimination of food waste, while other salts, water, and nutrients are sent to the circulatory system.
2. The circulatory system is used to transport the salts, water and nutrients to the cells and also to transport from the cells. The circulatory system then work together with two other body systems: the urinary and the respiratory.
3. The respiratory system takes oxygen in and sends this to the circulatory system. The circulatory system then sends carbon dioxide to the respiratory system for elimination.
4. The urinary system and the circulatory systems work together by giving and taking of water and solutes. The urinary system will eliminate the excessive amounts of water, salts, and wastes.
An animal's environment plays a vital role in the respiration process. Animals, which live in water, e.g., trout, may spend 20% of its energy to stir water around its gills. In contrast, a buffalo, who is quietly chewing and standing in one spot, may spend only 2% of its energy to breathing. The reason for this is that when water is full of dissolved oxygen, it will contain only 5% of what the air contains, salt and warm water will hold even less amounts. Land animals face a different danger. If the respiratory membranes become dried out, they will stick together. Once these membranes stick together, the gases will not be able to spread out across them. To cope for this, animals living on land will keep these surfaces moist with the help of secretions.
Sources:
1. Editors. The World Book Encyclopedia. World Book-Childcraft International, Inc: Chicago. 1990
Further Study:
Cellular Respiration
Description with images of respiration process.
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