1) What organ do humans use for respiration? a) Gills b) Skin c) Lungs d) Stomach 2) Why can’t gills function effectively on land? a) Require water to stay moist. b) No oxygen in air. c) Too big. d) They overheat easily. 3) What is the main function of alveoli? a) Pump blood b) Exchange gases c) Produce hormones d) Filter toxins 4) What scientific concept is demonstrated when comparing lungs and gills? a) Homeostasis b) Counter-current exchange c) Adaptation to environment  d) Photosynthesis 5) Which of the following is a similarity between gills in fish and lungs in humans? a) Both require dry environments to function b) Both are used for locomotion c) Both filter food from water d) Both are respiratory organs that exchange gases with the environment

RESPIRATORY SYSTEMS

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