1) Which gas does blood take from the lungs? a) nitrogen b) carbon dioxide c) oxygen d) hydrogen 2) Which gas do we exhale (breath out)? a) heart b) Carbon Dioxide c) Oxygen d) Hydrogen 3) Which of these damages the liver? a) smoking b) exercise c) eating sweets d) drinking alcohol 4) What is the lower chamber of the heart called? a) ventricle b) atrium c) air sac d) capillary 5) Where does digestion take place? a) lungs b) stomach c) kidney d) liver 6) What is the muscle part of the eye? a) Iris b) Pupil c) lense d) Cornea 7) What is the Brain made out of? a) Muscle b) Tendons c) Fat, nerves, and fluid 8) What body system is the heart apart of? a) Skeletal b) Muscular c) Nervous d) Circulatory

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