Body Organization and Structure THE WORK OF CELLS On a baseball team, every player has his job. Cells have their own positions (or jobs) in the body! RED BLOOD CELLS Groups of cells working together form a TISSUE There are 4 types of tissues: •  Epithelial Tissue •  Nervous Tissue •  Muscle Tissue •  Connective Tissue EPITHELIAL TISSUE Covers and protects underlying tissue. When you look at the surface of your skin, you see epithelial tissue NERVOUS TISSUE Sends electrical signals through the body. It is found in the brain, nerves and sense organs. MUSCLE TISSUE Made up of cells that can contract and relax to produce movement CONNECTIVE TISSUE Joins, supports, protects, insulates, nourishes, and cushions organs. It also keeps organs from falling apart. TISSUE + TISSUE= ORGAN Two or more tissues working together, form an organ. One type of tissue alone cannot do all of the things that several types working together can do. ORGAN + ORGAN = ORGAN SYSTEM Organs working together make up an organ system. The failure of any part can affect the entire system 11 MAJOR ORGAN SYSTEMS •  Integumentary system •  Reproductive system. •  Muscular system •  Nervous system •  Skeletal system •  Cardiovascular system •  Respiratory system •  Urinary system •  Lymphatic system •  Digestive system •  Endocrine system Integumentary System Includes skin, hair, nails and their underlying tissues Muscular System Skeletal muscles move bones. Skeletal System Bones frame and protect body parts. Cardiovascular System The heart pumps blood through blood vessels. Respiratory System Lungs absorb oxygen and release carbon dioxide. Urinary System Removes wastes from the blood and regulates body fluids. Reproductive System Females produces eggs, feed/shelter unborn baby- males produce sperm. Nervous System Receives and sends electrical messages. Lymphatic System Returns leaked fluids to blood vessels and helps flush harmful germs out. Digestive System Breaks down food into nutrients . Endocrine System Glands regulate body functions by sending out chemical messages. ORGAN SYSTEM ORGANS TISSUES CELLS DISCUSSION QUESTION 1. Explain the relationship between cells, tissues, organs and organ systems.