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.
Instead, these diagrams show contacts as either normally open (NO) or normally closed (NC) . The standard method of showing contacts is to indicate the circuit condition produced when the actuating device is in the de-energized (off) state. For example, in the following illustration, the contacts are part of a relay.witch Symbols Various types of switches are also used in control circuits. Like the contacts just discussed, switches can also be normally open or normally closed and require another device or action to change their state. In the case of a manual switch, someone must change the position of the switch.