The Hierarchy of the Structure in Animals Most organisms are composed of millions of cells all working together. These organisms are called multicellular organisms and include a wide variety like… Since it would be difficult for each cell in a multicellular organism to perform all of the necessary life processes ( i.e. pumping blood, removing wastes, digesting food etc), cells group together and become specialized. Define: Hierarchy Arrange the following terms in their hierarchal order then define each one. Cell Tissues Organ Organ system Types of ANIMAL TISSUES In animals, cells specialize to form 4 types of tissues. The cells in each tissue work together to complete important tasks. 1. Epithelial Tissue - this tissue acts as a protective barrier - found________________ (i.e. skin) - _________________ lining the body cavity - these tissues also produces chemicals like water, hormones, and enzymes(i.e. to digest food). 2. Connective Tissue - cartilage (cushions bones) - ligaments - blood - tendons hold muscle to bones 3. Muscle Tissue - tissues to help animals move. -there are 3 types: 1) _________ -- move your bones 2) _________ -- can't control this type of muscle 3) _________ -- heart muscles which moves blood 4. Nervous Tissue - "Communication tissue" - create and send messages which are called __________ - also stores information (i.e. memories) Homework: Read Chapter 3.3 & 3.4. Create a table in your notes. Write down each organ that makes up the organ systems in the human body and state its function. Label the diagram of the digestive system.