This printable word search puzzle on the topic of Human Body Systems contains 15 hidden words in a 17x17 letter grid. Words go horizontally, vertically, backwards, and diagonally. This word search is also available to download as a Microsoft Word document or a PDF.
carbon monoxide
carbon dioxide
bronchitis
diaphragm
nicotine
alveolus
bronchus
trachea
plaque
exhale
inhale
energy
oxygen
cilia
tar