digestive system
breaks down food into simpler substances so it can be used and absorbed into the body
respiratory system
the system which involves the lungs and airways
excretory system
removes nasty waste materials from the body, some of which are poisonous
circulatory system
the system which includes the heart, blood and vessels
reproductive system
the system for producing offspring
nervous system
comprises the brain, spinal cord and nerves
endocrine system
produces chemicals called hormones and secretes them into the bloodstream
skeletal system
made up of 206 bones - their main job is to support
muscle system
attached to the bones - they cause movement when they contract and relax
9
number of human organ systems
tissues
is made from a group of cells with a similar structure and function, which all work together to do a particular job
organs
is made from a group of different tissues, which all work together to do a particular job
organ system
is made from a group of different organs, which all work together to do a particular job