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CP2:2 Respiratory Physiology - Structure & Function
Questions and stuff
18
Medical
Graduate
01/06/2012

Additional Medical Flashcards

 


 

Cards

Term
What are the lung primary and secondary functions?
Definition

Gas exchange

 

Metabolic, Filter, Blood Reservoir

Term
Four stages of respiration
Definition

I: Ventilation

II: Pulmonary gas exchange

III: Gas transport

IV: Peripheral gas exchange

Term

Which parts make up the conductive system (dead space)?

 

How much volume is dead space?

Definition

Trachea -> main bronchi -> lobar bronchi -> segmental bronchi -> terminal bronchi

 

first 16 generations

 

150 ml

Term

What makes up the gas exchange system?

 

What is another name for these respiratory zones?

 

What volume can it hold?

Definition

respiratory bronchioles -> alveolar ducts -> alveoli

 

last 7 generations

 

aka acinus


2.5-3 L

Term

Bronchus has _____ cartilage.

 

Bronchiole has _____ cartilage.

Definition

Bronchus has incomplete cartilage.

 

Bronchiole has no cartilage.

Term
The combined cross section of daughter branches is generally _____ than the mother bronchus.
Definition
greater than
Term
What is the narrowest part of the airway?
Definition
4th generation (bronchioles)
Term

During inspiration, air travels to the terminal bronchus by _____.

 

Beyond that, how does it travel?

Definition

bulk flow

 

diffusion

Term
Compliance and elasticity
Definition

Compliance is dV/dP.

Elasticity is inverse of compliance.

Term
Normal breath of 500mL requires distending pressure of _____.
Definition
less than 3cm water
Term

How thick is the blood-gas interface?

 

What is its surface area?

Definition

extremely thin

 

50-100 square meters

Term

Epithelium lines _____.

 

Endothelium lines _____.

Definition

alveoli

 

capillaries

Term
Type I pneumocytes
Definition

Large, flattened cells

 

gas exchange

 

account for 90% of the surface area

Term
Type II pneumocytes
Definition

Large, cuboidal cells

 

synthetic, secretory functions

 

twice as many in number as Type I cells

Term
Concepts of Fick's Law of Diffusion
Definition

Volume of gas crossing membrane is

 

-directly proportional to the area, diffusion constant, pressure difference

-indirectly proportional to the thickness

Term
Solubility of CO2 vs O2
Definition
CO2 is 20x more soluble
Term
Alveolar Oxygen Equation
Definition
PAO2 = 713 * FiO2 - PaCO2 / 0.8
Term
Bronchial circulation
Definition

Supplies conducting airways to terminal broncioles.

 

High pressure, low flow.

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