3. Describe the functions of each of the eleven organ systems.

integumentary - protection, produce vitamin d

reproductive - produce offspring

nervous-take messages in, process them, send messages out

endocrine-control body chemically by producing hormones

digestive-absorb nutrients and calories

cardiovascular-move stuff around the body

respiratory-take in O2 gas and get rid of CO2

immune-fight off invaders

skeletal-provide a framework and protect vital organs

muscular-allow movement

urinary - remove waste and control water balance