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Digestive Lev-1
Term | Definition |
---|---|
nutrients | Compounds found in the environment that living organisms need to grow and survive. The 6 types are water, fat, proteins, carbohydrates, vitamins, and minerals. |
digestion | A process that breaks down the foods that we eat into molecules small enough to be absorbed (taken in) by cells. It can be mechanical or chemical. |
mechanical digestion | The physical breakdown of food into smaller pieces, by chewing, grinding, mixing. |
chemical digestion | The process of digesting (breaking down) food into small molecules by enzymes. |
enzymes | Special chemicals that speed up chemical reactions. |
glands | The special organs where enzymes are made. |
mouth | The place where mechanical AND chemical digestion begins. Mechanical: teeth cut and chop food. Chemical: enzymes in saliva start to digest starch. |
esophagus | The tube that leads from the mouth to the stomach. |
stomach | The pouch-like muscular organ where food gets mixed with gastric juices and churned into a watery paste. Both mechanical & chemical digestion occur here. |
small intestine | The organ after the stomach where chemical digestion occurs. Also where nutrients are absorbed into the blood to go to the cells. |
large intestine | The organ where extra water is removed from the nutrient-free mixture, to be sent back to the body. |
rectum | The organ where feces is stored before being removed from the body through the anus. |
anus | The hole at the end of the rectum where food exits the body. |
feces | The waste material left over after nutrients have been absorbed from food, and the extra water has been absorbed by the large intestine. |
carbohydrate | A nutrient that is made of simple sugars. |
protein | A nutrient that is made of amino acids |
blood | A red liquid that is considered a tissue. It carries nutrients (and other substances) to all the cells of the body |
tissues | A group of similar cells working together. |
organs | Special structures in a body made up of tissues. Each has a specific job or jobs. |
atom | The smallest unit of matter. |
molecule | It is made of 2 or more atoms held together by bonds. |
compound | Substance made of lots of the same kind of molecules (not just of single atoms). |
bonds | The attractions (forces) that hold atoms together to make molecules. They contain energy! |