RS Exam Practice Questions With Verified Answers

The main sites of gas exchange between atmospheric air and the bloodstream are the ___________ - Answer alveoli Which best describes inspiration? - Answer Movement of air from the atmosphere into the respiratory tract. What structure would air flow through next after passing through the nose? - Answer Pharynx The ___________ are the tubes through which air flows from the external environment to the alveoli and back. - Answer airways The conducting zone includes the_________ terminal bronchioles bronchi trachea alveoli respiratory bronchioles - Answer terminal bronchioles bronchi trachea What structure are present in all parts of the pulmonary system categorized as the respiratory zone? - Answer Alveoli The epithelial surfaces of the airways through the respiratory bronchioles, contain _________ that constantly beat upward toward the pharynx to aid in the removal of inhaled particulates. - Answer cilia Always and alveoli contain immune cells called ____________ that engulf and destroy inhaled particles and bacteria. - Answer macrophages Tiny, hollow air sacs within the lungs that are principally responsible for gas exchange are called ____________ - Answer alveoli Red blood cells have an average diameter of approximately ___________, and the thickness of the barrier separating alveolar air from pulmonary capillary blood is approximately. - Answer 7 micrometers; 0.2 micrometers The extreme thin fluid layer that is between membranes surrounding the lungs and lubricates their surfaces is known as the _____________ fluid - Answer intrapleural As inspired air enters the lungs, the first structures encountered that are part of the respiratory zone are the _____________ - Answer respiratory bronchioles Which is TRUE about alveolar and atmospheric pressures with regards to bulk flow of air in the respiratory system? - Answer During an expiration alveolar pressure is greater than atmospheric pressure. Inspiration occurs when __________ - Answer alveolar pressure is less than atmospheric pressure Atmospheric is greater than alveolar pressure According to Boyle's Law, when the volume of a closed space increases at a constant temperature: - Answer the total gas pressure within that space decreases At the end of an unforced expiration when the respiratory muscles are relaxed and there is no airflow, __________ - Answer the intrapleural pressure is less than atmospheric pressure During a normal cycle of respiration, there is a pause prior to inspiring a breath, and a pause in between inspiring and expiring the breath. Which of these conditions is the SAME during those two pauses?