Student Name: Veronica Heldenbrand Access Code (located on the lid of your lab kit): AC-0BD2UFC Pre-Lab Questions 1. Name two functions of the nasal cavity mucosa. Moisturizes/temperature regulation and trapsinfectious particles/allergens. 2. Why isthe trachea reinforced with cartilaginous rings? Breathing causes pressure changes. The cartilaginousrings prevent collapse. 3. Describe the path a molecule of oxygen takes to get to body tissue, starting with the nares. - Nares - Pharynx - Larynx - Trachea - Bronchi - Bronchioles - Alveoli - Left ventricle - Aorta - Artery - Arteriole - Capillaries 4. What is asthma? A chronic inflammatory condition of the airways causing breathlessness and wheezing due to narrowing of the airways and tightening of surrounding muscles. There is an increased production of phlegm. Often accompanied in the morning/night with a cough. Experiment 1: Microscopic Anatomy of the Respiratory System Table 1: Experimental Observations Respiratory Image Description of Visible Structure(s) Trachea Goblet cells, basement membrane, lamina propria, celia, columnar cells and connective tissue Lab 13 The Respiratory System BIO202L Lung Bronchi, capillaries, alveoli, aveolarsacs and bronchioles Post-Lab Questions 1. Label the arrows in the slide images below. A- Goblet Cells B- Basement membrane C- Lamina propria connective tissue D- Cilia E- Blood Vessel F- Bronchi G- Alveoli H- Alveolar sac Lab 13 The Respiratory System BIO202L 2. Whatstructural features of alveoli make them an ideal place for gas exchange? Alveoli have a large surface area and very thin walls 3. Why is mucus present in the trachea? To trap small particles such assmoke and pollen 4. What is the specific function of the cilia on the walls of the trachea? Cilia aid in mucus movement in preparation for expectoration. Cilia also filtersmall particles. Experiment 2: Virtual

Model – The Respiratory System