USMLE Step 1 Respiratory Physiology Review 61 18 Deposition of inhaled particles

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Play USMLE Audio MP3  61 18 Deposition of inhaled particles Below

Begin 61 18 Deposition of inhaled particles Transcription

Moving now to deposition of inhaled particles by size.

What happens to inhaled particles that are greater than 10 micrometers in size?

• Particles greater than ten micrometers in size adhere to nasal hairs or mucosal linings in the nose and pharynx

What happens to particles two micrometers to ten micrometers in size?

• Particles 2 to 10 micrometers in size settee on bronchial walls

How are these particles removed?

• They are removed by cilia, coughing, and bronchial constriction

What happens to particles that are between .5 and 2 micrometers?

• These are ingested by marcophages in the alveoli

What happens to particles that are less than .5 micrometers in size?

• They are exhaled in the air

Now I’ll give the description. Please respond with the range of size.

First, these particles settle on bronchial walls and are removed by cilia, coughing, and bronchial constriction.

• 2 to 10 micrometers

Second, these adhere to nasal hairs and mucosal linings in the nose and pharynx.

• Greater than 10 micrometers

Third, these are ingested by macrophages in the alveoli.

• Between .5 and 2 micrometers

Fourth and last, these are exhaled in the air.

• Less than .5 micrometer

Student doctor, please pause the tape and summarize the deposition of inhaled particles by size.

• Particles greater than 10 micrometers in size adhere to nasal hairs or mucosal linings in the nose and pharynx. Particles two to ten micrometers in size settle on bronchial walls. They are removed by cilia, coughing, and bronchial constriction. Particles between .5 and 2 micrometers are ingested by macrophages in the alveoli. Finally, particles less than .5 micrometer in size are exhaled in the air.

****END OF TRANSCRIPTION****

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