Biochemistry 3381A Lecture Notes - Connective Tissue, Nervous Tissue, Cardiac Muscle

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During development, the cell divides repeatedly to produce many different cells in a precise and complex pattern. The pattern is mostly determined by the genome. In every cell, the genome is identical but the cells differ because they select to express a different set of genes. In our whole body, humans are made up of hundreds of different cell types. Our cells also have a memory and the genes expressed depend on the cell s past as well as its present environment. Cells (muscle, neurons, skin cells) don t just maintain their specialized characters because it receives the same instructions from their surroundings, but because they have a record of signals their ancestors received during embryonic development. All of the different cell types that we have work together to form structures that achieve a common function, called tissues. These tissues can then work together to form an organ.

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