The Human Body Tissues Organs Function

Organization Smallest part of the human body that performs all the necessary life functions is ___________ Cells – the smallest unit of life Tissues – groups of cells with similar structure and function Organs – groups of tissues organized to perform a particular task Organ Systems – groups of organs that work together to perform a necessary life function (respiration, circulation, digestion)

4 Types of Tissues Tissue Function Example Picture Muscle Tissue Moves the body and substances within the body Biceps; triceps; heart; arterial walls Nerve Tissue Transmits messages throughout the body Brain; nerve cord; neurons Epithelial Tissue Covers the surfaces of your body Skin; lining of digestive system Connective tissue Connects or holds together parts of the body Bone; cartilage; fat; blood; tendons; ligaments

Human Body Systems and Their Functions Organ System Function Example Integumentary (skin) Protects; receives stimuli from the environment; helps control body temp; produces vitamin D; removes some waste Skeletal Supports and protects the body; allows movement; makes blood cells Muscular Moves the body and substances within it Digestive Breaks down food into simple nutrients that body cells can use

Organ System Function Example Circulatory Delivers nutrients and oxygen to body cells and carries away wastes from cells Lymphatic Helps protect the body from disease-causing organisms Respiratory Moves oxygen through the blood and carbon dioxide out of the body Excretory Removes cells’ waste products

Organ System Function Example Nervous Receives and transmits messages throughout the body Endocrine Controls many body functions to keep the body working properly; coordinates systems Reproductive Produces male and female sex cells; female organs nourish and protect developing embryo Immune Protects the body against disease-causing organisms and substances