Respiratory System

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Across
  1. 2. the membrane-lined cavity behind the nose and mouth, connecting them to the oesophagus.
  2. 4. any of the minute branches into which a bronchus divides.
  3. 6. the hollow muscular organ forming an air passage to the lungs and holding the vocal cords in humans and other mammals; the voice box.
  4. 7. the part projecting above the mouth on the face of a person or animal, containing the nostrils and used for breathing and smelling.
Down
  1. 1. a large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; the windpipe.
  2. 3. the opening and cavity in the lower part of the human face, surrounded by the lips, through which food is taken in and vocal sounds are emitted.
  3. 4. any of the major air passages of the lungs which diverge from the windpipe.
  4. 5. each of the pair of organs situated within the ribcage