NATS 1675 Lecture Notes - Lecture 4: Smooth Muscle Tissue, Cell Type, Skeletal Muscle
20 Sep 2016
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Document Summary
Organs work together in systems (ie. , the nervous system) Populations are members of one species of organism. Communities interact with the environment in an ecosystem. Is dependent on technology (better microscopes, fixing techniques and stains) We need to learn to see cells. Shows that cells have the features of living organisms. Cellular structures partly explain the functioning of tissues in the organs, and in the organ systems. A tissue is composed of specialized cells of the same type that perform a common function in the body. Binds and supports the body parts: muscular, moves the body and its parts, nervous. Cells can contract due to filaments of actin and myosin. Striated cells light and dark bands due to actin and myosin placement in the cell. Fibres are long and cylindrical cells (a fusion of several cells multiple nuclei) Muscle striations are caused by organized overlapping actin and myosin filaments. In walls of internal organs and blood vessels.
