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Fundamentals
Test 4
28
Other
Not Applicable
04/14/2008

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Term

Oxygenation

Definition
How well cells, tissues and organs supplied with oxygen
Term

Three basic concepts

Definition
  • Get O2 into the body
  • Circulate O2 through the body
  • Use O2 properly and rid body fo CO2
Term
Pulmonary Ventilation
Definition

Consists of Inhalation and Exhalation

Term
External Respirations
Definition
alveolar-capillary gas exchange
Term
Internal respiration
Definition
capillary-tissue gas exchange
Term
Ventilation
Definition
Process of moving gases in and out of the lungs
Term
Ventilation requires
Definition

Coordination of muscles

Major inspiratory muscle: diaphragm

Term
work of breathing determined by
Definition

rate and depth of breathing

degree of compliance of lungs

airway resistance

presence of active expiration

use of accessory muscles

Term
Inspiration
Definition
an active process, stimulated by chemical receptors in the aorta
Term
Expiration
Definition

normally passive process that depends on the elastic recoil of the lungs

Term
Elastic Recoil
Definition
produced by elastic fibersi n the lung and by surface tension in the fluid film lining alveoli
Term
Surfactant
Definition

the chemical produced by alveolar type 2 cells that maintains the surace tension of the alveoli and keeps them from collapsing

Term
hyperventilation
Definition
rate and delpth of breathing increase enough to move large amount of air through lungs
Term
S/S of Hyperventilation
Definition
  • increased rate and depth of respiration
  • bentilation greater than that whichi is required to eliminate normal CO2 levels
  • more CO2 eliminated
  • excess CO2 exhalation can lead to loss of consciousness
Term
Hypoventilation
Definition
decreased rate or depth of breathing moves only small amount of air in and out of lungs
Term
Hypoxemia
Definition
low oxygen in the blood
Term
Hypoxia
Definition
low oxygen levels in the tissue
Term
S/S of hypoxia
Definition

Early Sign: rapid pulse, rapid shallow respirations, dyspnea, flaring of nostrils, restlessness

Term
lung compliance
Definition
ability of lungs to distend or expand in response to increased intra-alveolar pressure
Term
Elastic Recoil
Definition
Tendency of elastin fibers to return to their original position after being stretched
Term
Airway resistance
Definition

resistance to airflow within the airways

  • the larger the diameter of the airway, more easily air flow through it

the pressure difference between the mouth and the alveoli in relation to the rate of flow of inspired gas

Term

Alveolar-Capillary gas exchange

Definition
method of transport is simple diffusion: molecules move from area of greater to lesser concentration
Term
Diffusion
Definition

effected by pressure: the higher the O2 pressure in alveoli, faster oxygen diffuses into blood

thickness of the membrane

condition of surface area

CO2 diffuses 20x faster than O2

Term
Capillary-Tissue Gas exchange
Definition

Occurs in body organs and tissues

Requires adequate external respiration and peripheral circuatlion or tissue hypoxia may occur

Term
Control of Breathing
Definition

Chemoreceptors in medulla, carotid arteries and aorta

Blood CO2 level provides primary stimulus to breathe

Secondary stimulus is hypoxemia

 

Term
Oxygen Transport
Definition

Depends on:

Ventilation

Perfusion

Oxygen-carrying capacity

Term

O2 carrying capacity

Definition
Hemoglobin carries 97% of diffused O2
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