BIO 106 Lecture Notes - Dental Caries, Atomic Number, Salt
21 Jul 2022
Department
Course
Professor
Document Summary
Living organisms are composed of matter, which is anything occupies space and has mass (weight) An element is a substance that cannot be broken down to other substances by ordinary chemical means. There are 92 elements in nature - only a few exist in a pure state. A compound is a substance consisting of two or more different elements in a fixed ratio. Compounds are more common than pure elements. Sodium chloride, table salt, is a common compound of equal parts of sodium (na) and chlorine (cl) About 25 elements are essential for human life. Four elements make up about 96% of the weight of most living organisms. Trace elements are essential but are only needed in minute quantities. Some trace elements are required to prevent disease. Without iron, your body cannot transport oxygen. An iodine deficiency prevents production of thyroid hormones, resulting in goiter. Fluoride is usually added to municipal water and dental products to help reduce tooth.
