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Human Body

16 tIssuEs saltwater archipelagos Tissues are communes of similar cells performing the same tasks several make up any organ. Tissues fall into four major classes Epithelial tissues are highly selective about what they let in and out, forming linings of hollow and tubular organs many make a mucus matrix to protect and extend the border they control. Connective tissue includes wandering and static cells they deposit artefacts outside their walls to build ultrastructures and general meshwork, as well as defining your immune boundaries. Muscle comes in three types Skeletal muscle contracts linearly under conscious control smooth muscle squeezes circularly, narrowing the tubes in whose walls it writhes, subconsciously guided by autonomic nerves and heart muscles tireless cells also pass on electricity to their neighbours, at differing speeds in order to synchronise the pattern of cardiac contraction. Apart from a few nerve cells in the guts which have a mind of their own all nerves are linked in one giant electrical system. Like Gaia, and life in general, we are twothirds live saltwater, which bathes and joins all tissues. The three primary fluids are intracellular fluid, which varies according to cell extracellular fluid, the sea around cells and blood below, half cellular mostly red corpuscles carrying gases and half fluid, plasma, carrying various minerals and molecules between the different tissues.
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