glossary
caffeine
(kah-FEEN) a chemical found in certain foods that
speeds up activity in our body
electronics
(ih-lek-TRAH-niks) things like games and
computers powered by electricity
hormones
(HOR-mohnz) chemicals produced by our body
that control the activity of certain cells and organs
hygiene
(HYE-jeen) keeping yourself clean or other actions
that support good health
relax
(rih-LAKS) to become less active
schedule
(SKEH-jool) a plan with a list of events and times
tissues
(TIH-shooz) groups of similar cells that perform
certain jobs in our body
glossary & index
awake, 20
bedtime, 18
body, 4, 8
brain, 12, 18
healthy, 6, 22
rest, 4
index
24
