Sophia - Human Biology - Unit 4 Challenge 1. 1 — Lower Respiratory Tract Determine the role of the lower respiratory system in breathing. In which part of the respiratory system does the exchange of gasses between the bloodstream and air occur? • a.) Trachea • b.) Bronchi • c.) Nose • d.) Lungs 2 — Upper Respiratory Tract Identify the role of the upper respiratory tract in breathing. Which part of the upper respiratory system helps produce the sounds necessary for speech?...