lungs, are the central organs of the respiratory system in humans and some other animals, including tetrapods, some snails and a small number of fish, gas exchange, physical process by which gases move passively by diffusion across a surface., circulatory system, delivers nutrients and oxygen to all cells in the body, respiratory system, also called as breathing system, oxygen gas, gas that is inhaled, carbon dioxide, gas that is breathe out, alveoli, Tiny air sacs at the end of the bronchioles, bronchial tube, are sometimes referred to as bronchi or airways, nose, is the entrance to your respiratory system, bronchioles, they carry air to small sacs in your lungs, pharynx, also called throat, larynx, protect the lower respiratory tract from aspirating food into the trachea while breathing., trachea, also called windpipe, diaphragm, a muscle that helps you inhale and exhale (breathe in and out)

Grade 9 Science

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