Physiology 3140A Lecture Notes - Lecture 2: Inner Cell Mass, Spinal Cord, Blastocoel
10 May 2020
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Document Summary
Pattern of development is determined by the genome. Cells divide during development, producing many different cells and cell types. They do so in a very precise and complex pattern. The genome is identical in all cells, and the cell can select which genes are expressed. Selected gene expression regulates proliferation, differentiation of cells, cell migration, and cell-cell interaction. Cells have an ancestral genome that pushes it to differentiate into something specific, regardless of its environment. Mental activity, sensory input and integration, regulates muscles and glands, homeostasis. Energy storage (ie. nutritional support for epithelium), protection of organ, tissue repair, structure. Types: adipose (fat) or collagen based (ie. bones, teeth, cartilage, tendons) Blood vessel cells, alveoli, lining of gut, epidermis. Regulates nutrient and oxygen transport, metabolic waste, immune system. Result: a dense ball of 32 cells called a morula. The cells continue to divide, and a cavity is formed to pump nutrients and water to feed the cells on the inside.
