Digestive system, The group of organs that breaks down food so the body can use it., Swallow, To move food or drink from your mouth down into your stomach., Respiratory system, The group of organs that helps us breathe and exchange gases., Breath, The air that you take into or let out of your lungs., Breathe, To take air into your lungs and let it out., Oxygen, A gas in the air that our bodies need to live., Carbon dioxide, A gas that our bodies produce and breathe out., Science, The study of the natural world through observation, questions, and investigation., Sensory, Related to the senses or the way we receive information through our senses., Arteries, Blood vessels that carry blood away from the heart., Veins, Blood vessels that carry blood back to the heart.

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