OCEAN OF KNOWLEDGE

                 Tissues There are four types of tissues in the human body: • muscle tissue • nerve tissue • connective tissue • epithelial tissue Muscle tissue is responsible for movement in the body. Think of all the different ways you can move your body: walking, lifting, writing all involve muscle tissue. Muscle tissue also allows your body to move in ways you can’t often see. For example, did you know that your heart contains muscle tissue? The muscle tissue in your heart allows it to contract so it can pump blood to your whole body. Nerve tissue transmits messages through the body. It is crucial for our safety because it tells us how to respond to various changes inside and outside the body. For example, when you touch something hot, nerve tissues are what detect the heat and send a warning message to your brain. Connective tissue holds other tissues together, and protects and insulates organs. This tissue is fibrous and helps g...

             Cell Organization In a multicellular organism, such as humans, cells are specialized and organized to work together. Groups of similar cells that have a common function form a tissue. Tissue cells are often stuck together with fibres or other sticky material. Groups of tissues having a common function are organized into organs. Many organs are made up of several different types of tissues. Some examples of organs in your body include the heart, lungs, kidney, liver, skin, eye, brain, and ears. Some examples of organs in plants are the roots, stems leaves, stamens, and ovaries. Groups of organs having a common function form an organ system. The human body is made up of many systems including the: • circulatory system • digestive system • excretory system • respiratory system • immune system • skeletal system • nervous system

       Levels of Organization in Organisms         Introduction Systems are made up of individual parts that work together and are usually connected to one or more other systems. If one part of the system is damaged, the system will not function well or may not function at all. These characteristics are true of systems in the human body. The human body is a complex system of interdependent parts that work together—understanding how these parts work help us to understand the whole system.