1. Notes/Answers for the Necessary Life Functions graphic organizer

2. Necessary Life Functions (8 total)
Processes the body must do to keep us alive
Maintaining boundaries – the internal (inside) environment remains distinct (different) from the external (outside)
Cellular level – by plasma/cell membranes
Organismal level – by the skin
Movement – locomotion (move from point A to Point B), propulsion (peristalsis: move food), and contractility (muscles shorten)
Responsiveness – ability to sense changes in the environment and respond to them
Digestion – breakdown of ingested foodstuffs
Homework 8/12
Continued on next slide

3. Necessary Life Functions
Metabolism – all the chemical reactions that occur in the body
Excretion – removes wastes from the body
Reproduction – creating new life on the cellular and organismal levels
Cellular – a cell divides and produces two identical daughter cells
Organismal – sperm and egg unite to make a whole new person
Growth – increase in size of a body part or of our whole body