tissues

• 1st structural levels the body is organised in

  cells are specialised to carry out a different function
• 2nd structural level the body is organised in

  cells with simlar specialisations are grouped together to carry out a common function in tissues
• 3rd structural level the body is organised in

  different types of tissues work together as organs
• 4th structural level the body is organised in

  groups of organs working together for a common purpose form organ systems
• how the body is made up

  cells -> tissues -> organs -> organ systems -> organism (one living thing)
• 4 basic types of tissue

  epithelial tissue, connective tissue, muscular tissue, nervous tissue
• tissue

  group of cells that are similar in structure and work together to carry out a particular task
• epithelial tissue is a covering or lining, the cells are closely joined together and form a smooth surface (can be thin/flat, column shaped/cubed shape)
• epithelial tissue location

  outer layer of skin, outer and inner lining of the heart, kidneys, intestines, liver and lungs
• connective tissue provides support for the body and helps to hold all body parts together. the cells are not close together and are separated by non-cellular material (matrix)
• connective tissue location

  bone, cartilage, tendons, blood, fat tissue and ligaments
• muscular tissue has cells (muscle fibres) that are long and thin that contract and become shorter when responding to a stimulus
• 3 different types of muscle tissue

  smooth tissue, cardiac tissue, skeletal tissue
• nervous tissues are made of nerve cells (neurons) which have long projections from the body of the cell (dendrites and axon)
• nervous tissues are found in the brain, spinal chord and all nerves
• differentiation is the process cells undergo to become specialised for a particular function