Author Question: Identify the nonprimary function of the respiratory system. a. Filter out inhaled contaminants, ... (Read 93 times)

soccerdreamer_17 · **on:** Jul 16, 2018

Identify the nonprimary function of the respiratory system.

a. Filter out inhaled contaminants, various chemicals, and small blood clots.
b. Exchange of gases between blood and tissues.
c. Continuous absorption of O2 and excre-tion of carbon dioxide.
d. Transport oxygenated blood to the tissues.

Question 2

Which of the following has/have been shown to injure the alveolar-capillary membrane? 1. Excessive pressures 2. Excessive tidal volumes 3. Increased intracranial pressures 4. Pulmonary hypertension

a. 1, 2, and 4 only
b. 2 and 3 only
c. 4 only
d. 1, 2, 3, and 4

jointhecircus · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: A
The primary role of the respiratory system is breathing, external respiration (the continuous ab-sorption of O2 and the excretion of carbon dioxide), and the support of internal respiration, which is the exchange of gases between blood and tissues. The respiratory system is also equipped to filter out inhaled contaminants, while warming and humidifying inspired gas and simultaneously filter out various chemicals and small blood clots that are deposited or formed in the blood.

Answer to Question 2

ANS: A
Conditions of pulmonary hypertension (e.g., capillary pressure >30 mm Hg during congestive heart failure and high-altitude pulmonary edema) and excessive tidal volume and airway pressure during positive-pressure ventilation (e.g., tidal volume >6 ml/kg and airway pressures >30 cm H2O) can result in stress failure of the blood-gas membrane. Stress failure results in endothelial and/or type I cell stretching and shearing injuries.