MESA CC BIO 202 FINAL EXAM QUESTIONS & ANSWERS

MESA CC BIO 202 FINAL EXAM
QUESTIONS & ANSWERS
1. The main site of gas exchange involved in ventilation is the ________.
A) alveolar sacs
B) alveoli
C) alveolar duct
D) respiratory bronchiole
E) tissue cells - ANSWER B) alveoli

2.Secrete a fluid containing surfactant.
A) Alveolar duct
B) Segmental (tertiary) bronchi
C) Type I alveolar cells
D) Respiratory bronchioles
E) Type II alveolar cells - ANSWER E) Type II alveolar cells

3. Complete the following statement using the choices below. Air moves out of the lungs
when the pressure inside the lungs is ________.
A) less than the pressure in the atmosphere
B) greater than the pressure in the atmosphere
C) equal to the pressure in the atmosphere
D) greater than the intra-alveolar pressure
E) 1atm - ANSWER A) less than the pressure in the atmosphere
(should be greater)

4. Surfactant helps to prevent the alveoli from collapsing by ________.
A) humidifying the air before it enters
B) warming the air before it enters
C) interfering with the cohesiveness of water molecules, thereby reducing the surface
tension of alveolar fluid
D) protecting the surface of alveoli from dehydration and other environmental variations
E) having water as a constituent part - ANSWER C) interfering with the cohesiveness of
water molecules, thereby reducing the surface tension of alveolar fluid

5. With the Bohr effect, more oxygen is released because a(n) ________.
A) decrease in pH (acidosis) strengthens the hemoglobin-oxygen bond
B) decrease in pH (acidosis) weakens the hemoglobin-oxygen bond
C) increase in pH (alkalosis) strengthens the hemoglobin-oxygen bond
D) increase in pH (alkalosis) weakens the hemoglobin-oxygen bond
E) all of the above - ANSWER B) decrease in pH (acidosis) weakens the hemoglobin-
oxygen bond

6. Respiratory control centers are located in the ________.