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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