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.
A Direct Current circuit is a circuit that Electric Current flows through in one direction. DC is commonly found in many low-voltage applications, especially where these are powered by Battery. Most electronic circuits require a DC power supply. A Direct Electric Current flows only when the Electric Circuit is closed, but it stops completely when the circuit is open. A Switch is a device for making or breaking an Electric Circuit. While the Switch is closed, Figure 1(a), the circuit is closed and the Light Bulb turns On; while the Switch is opened, Figure 1(b), the circuit is open and the Light Bulb turns Off.