What is the primary mechanism for central airway deposition of particles in the 1- to 5-µm range?
a. Impaction
b. Sedimentation
c. Diffusion
d. Brownian motion
ANS: B
During normal breathing, sedimentation is the primary mechanism for deposition of particles in the 1- to 5-µm range.
You might also like to view...
Answer the following statement(s) true (T) or false (F)
1. Ionic and nonionic contrast agents are used primarily for radiographic examinations of the urinary system. 2. Port-a-cath or venous access ports are infusion ports and used for long-term use. 3. PICC lines are large catheters inserted into a vein in the anterior part of the elbow. 4. Hickman catheters are double lumen catheters usually placed in the superior vena cava. 5. Cathartics are contrast agents used in radiographic imaging.
Roles of EMS providers who are the first responders to a hazmat incident include all of the following EXCEPT:
a. assessment of toxicologic risk. b. activation of IMS. c. initial containment procedures. d. establishment of incident command.
The children in a family all have blue eyes. The biological parents also have blue eyes. The science that explains these similarities is called:
A. genetics B. genetic engineering C. stem cells D. genomes E. genetic discrimination
Urine normally contains excess water, wastes, and:
A. protein B. blood C. sugar D. electrolytes