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The state of balance in the internal environment of the body it includes control of the water balance of the blood, body temperature, blood sugar level and blood urea level. Each of these internal factors is maintained by a separate mechanisms the central nervous system and the endocrine system. Before these systems can bring about any change they have to be supplied with information regarding the body state. Living cells and all the chemical reactions are controlled by enzymes; the enzymes are very sensitive to the conditions in which they work (PH). A slight fall in temperature or a rise in acidity may slow down or stop an enzyme from working and thus prevent an important reaction from taking place in the cell.
Cell membrane controls the substances which enter and leave the cell, but it is the tissue fluid which supplies or removes these substances, and it is therefore important to keep the composition of the tissue fluid as steady as possible. If the tissue fluid were too concentrated, it would withdraw water from the cells by osmosis and the body would be dehydrated. If the tissue fluid were too dilute, the cells would take up too much water from it by osmosis and the tissues would become waterlogged and swollen.
Outline classification of coelenterates
Evolution of migration Eg Benefits associated with migratory flights must be greater than those associated with staying in Alaska and having to tolerate seasonal changes
Q. Which is the kind of nitrogen waste eliminated by beings of the class Reptilia? These beings excrete mainly uric acid this substance is less toxic than ammonia and it can be
Oxygen concentration When oxygen is abundant, the rate of oxidation is independent of oxygen concentration, but at very low oxygen concentration, the rate is approximately prop
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Q. How do kidneys participate in the blood volume control? How is the blood volume of the body related to the arterial pressure? The kidneys and the hormones that act upon them
Reality Theory Developed in the 1960s by Willian glasser, a psychiatrist, reality therapists view human nature in terms of behaviour. They believe that human behaviour i
Homo neanderthalensis successfully lived in the cold, harsh ice-age conditions of Europe until becoming extinct approximately 30 000 years ago. Adaptations which enabled them to s
how to identified plants
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