KINE 1P90 Lecture Notes - Lecture 2: Sweat Gland, Epithelium, Nervous Tissue
3 Dec 2016
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Organization of the human body & homeostasis lec 2. Chemical level: atoms (oxygen, carbon, hydrogen and nitrogen = 96% of body) Combine to make molecules (proteins, fats, cho and nucleic acids) Sodium, potassium, calcium and iron are also included in body, but to lesser extent. Basic unit of structure and function in body. Smallest unit capable of carrying out processes associated with life. There are single-celled organisms (amoeba and bacteria) and simple celled organisms (sponge) The more complex an organism gets, the more diverse the cells are: cell differentiation. Body is made up of many types of cells, each with specialized functions. Synthesizing proteins (gland cells of digestive system. Reproducing (most cells, except nerve and muscle cells) When cells become different from one another (differentiation) Each cell has differentiated to have a specialized function. Tissue level: formed by cells with similar structure and specialized function, there are 4 primary tissue types: Muscle cells are specialized for contracting and generating force.
