Which structure labeled in the diagram contains the receptors that bind the inhaled chemicals? 
Definitions:
Free-Choice Question
A type of question that allows the respondent to answer in an open-ended format, providing personal insights or opinions without being restricted to predefined options.
Erasmus
Desiderius Erasmus of Rotterdam, a 15th-16th-century Dutch Renaissance humanist, Catholic priest, social critic, teacher, and theologian known for his works on theology, education, and for advocating for religious tolerance.
In Praise of Folly
A satirical essay written by Desiderius Erasmus, critiquing aspects of his society with humor and ironic wit.
Dutch Philosopher
A philosopher hailing from the Netherlands, known for contributing to a wide range of philosophical discussions and theories.
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