初一下册生物复习资料半期（The first volume of biology review data half period）.doc

初一下册生物复习资料半期（The first volume of biology review data half period） (1) the nutrients in food include: water, inorganic salt, sugar, fat, protein and vitamin 6. The sugars, fats, and proteins that provide energy are called the big three, and the most energy is fat. Energy storage is fat; The main source of energy is sugar. The main substance that makes up the cell is water, and the basic substance is protein. Inorganic salt is an important substance that regulates the metabolism of certain tissues and organs of human body, and protein is an important raw material for growth and development of human body, tissue renewal and repair. 2. Test the protein with diuretic reagent, and show the purple reaction; The vitamin C was tested with indolephenol reagent, which showed a fading reaction. The main sources of sugar are grains and potatoes, and the main sources of protein are lean meat, fish, milk, eggs and beans. The main sources of fat are meat, peanuts, sesame and vegetable oil. Plant-based foods do not contain vitamin A, but they contain beta-carotene, which can be converted into vitamin A in the body and vitamin A in animal foods. 4. Night blindness -- vitamin A deficiency Scurvy -- vitamin C deficiency; Beriberi - vitamin B1 deficiency; Oral anglitis, dermatitis - deficiency vitamin B2; Rickets -- vitamin D and calcium deficiency 6. Human digestive system includes digestive tract and digestive gland. The digestive tract includes digestive organs such as the mouth, pharynx, esophagus, stomach, small intestine, colon and anus. The largest digestive gland is the liver. Digestive juices that do not contain digestive enzymes are bile, which is used to make the large fat of food into tiny particles, thus increasing the contact area of fat particles, which is conducive to the digestion of fat. Intestinal and pancreatic digestive fluids contain the most kinds of enzymes. The function of the digestive tube is to contain, grind, stir and transport food. 7. Digestion: the nutrie