Connective tissue is one of the four main types of tissue that make up the body. These fibrous groups of cells are found throughout the body and hold together the other types of tissues, including muscles, nerves, and epithelium.They are made up of a combination of living cells and non-living material known as matrix.ense connective tissue, or collagen, has a much more closely woven matrix than loose connective tissue. The two varieties of this type are called regular and irregular. Tendons and ligaments are considered regular types, with the collagen fibers running parallel to each other to form the structure.
Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized.When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized.he Control Circuit is the part of the relay that determines when the output component is energized or de-energized. The control circuit functions as the coupling between the input and output circuits. In electromechanical relays, the coil accomplishes this function.
The OFF-NONE-ON or OFF-ON circuit is a maintained, single throw, two-position switch circuit. In general, for basic unlighted single pole switches, the ON position closes the circuit at switch terminals 1 & 2. For basic unlighted double pole switches, the circuit is closed at terminals 1 & 2 and 4 & 5.