ch2.4 how cells make a body

• tissue

  a group of cells that are similar in structure to carry out a particular task
• epithelial tissue is a covering/lining tissue
• examples of epithelial tissue: outer layer of skin, lining of stomach and intestines
• in epithelial tissue cells are joined very closely together
• epithelial tissue cells vary from thin and flat to column shaped and cubed
• epithelial tissue

  
• connective tissue: provides support for body and helps hold all the body parts together
• examples of connective tissue: bone, cartilage, tendons, ligaments
• in connective tissue cells are not close together and are separated by large amounts of material called matrix
• connective tissue

  
• muscular tissue also called muscle fibres
• muscles fibres are long, thin and can contract to become shorter
• skeletal muscle (voluntary) you can feel and control
• skeletal muscle has striations (striated muscle)
• smooth muscle (involuntary) you cannot control
• smooth muscle has no striations (non-striated muscle)
• examples of skeletal muscle: biceps, quadriceps, triceps
• examples of smooth muscle: diaphragm, uterus, intestines
• cardiac muscle makes up most of the heart
• nervous tissue is made up of specialised nerve cells called neurons
• neurons have long projection that carry messages from one end of the body to the other
• nervous tissue is found in brain, spinal cord and nerves