SYSTEMS | Notion

the human body as a system

system	parts	functions
digestive system	mouth, gullet, stomach, small intestine, large intestine, anus	- break down food into simpler substance (digestion)

digested food, minerals, water →absorbed
stores undigested food | | respiratory system | nose, windpipe, lungs | - take in oxygen
remove carbon dioxide | | circulatory system | heart, blood vessels, blood | - transport oxygen, digested food, minerals, water to body
remove carbon dioxide, waste materials away from body | | skeletal system | bones | - support body & for shape
protect organs | | muscular system | muscles | movement |

interconnected

digestive system

digestion: breaking down of food into simpler substances

absorption

storage & removal

organs and functions

organs	functions
mouth	- teeth: chew food into smaller pieces

tongue: mix saliva with food
salvia: digestive juices → breakdown food for swallowing | | gullet | muscles: push food from mouth → stomach | | stomach | muscular bag digestive juices → breakdown food | | small intestine | digestive juices → breakdown food digestion completed digested food, nutrients pass through walls of small intestine into blood | | large intestine | water, minerals absorbed undigested food: waste material passed through anus |

plants & their parts

parts & functions

parts	functions
root	- absorb water, mineral

hold plant firmly (support) | | stem | - support
hold up leaves | | leaves | - has chlorophyll photosynthesis: trap sunlight → make food
stomata: gas exchange, site of evaporation |

plant transport system

tubes	location	function
food-carrying tube (phloem)	leaves → other plant parts	- transport food
water-carrying tube (xylem)	roots → other plant parts	- transport water, minerals

support |

air & respiratory system

components of air

Carbon dioxide: breathing out Rare gases Oxygen Water vapour: breathing out, decay Nitrogen: most abundant gas Some other gas

breathing & respiration