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Respiratory System Physiology
From study.com
22
Physiology
Undergraduate 2
05/28/2015

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Term
A collection of air within the pleural cavity that causes the lungs to collapse is ...
Definition
a pneumothorax
Term
Intrapleural pressure is less or more than intrapulmonary pressure
Definition
less
Term
Air moves out of the lungs during expiration because
Definition
Intrapulmonary pressure is greater than atmospheric pressure
Term
Which of the following events occurs first during inspiration?
Definition
diahgram contracts
Term
What contributes the efficiency of gas exchange?
Definition
large surface area, speed of diffusion, lipid soluble gases, and thin respiratory membrane
Term
Why do we have millions of alveoli in each lung?
Definition
to increase the surface area for gas exchange
Term
What is true of lung expansion?
Definition
it creates an inward tension that makes lung expansion difficult.
Term
Why are lungs internalized in terrestrial animals?
Definition
because gas exchange requires a wet surface
Term
Which of the following best accounts for shortness of breath on top of a mountain?
Definition
lower atmospheric pressure
Term
Which of the following decreases the concentration of oxygen in the alveolar air?
Definition
addition of water vapor and carbon dioxide
Term
Consider the following mixture of gases: 20% oxygen, 40% carbon dioxide, and 40% nitrogen. What is the partial pressure of oxygen with a total pressure of 1000 mmHg?
Definition
200 mmHG
Term
Consider a situation in which the left lung is poorly ventilated, thus decreasing the partial pressure of oxygen to 80 mmHg. What would be the partial pressure of oxygen in the blood leaving the left lung?
Definition
80 mmHg as equilibrium is achieved
Term
Which of the following is the best description of blood leaving the metabolizing tissues and returning to the lungs?
Definition
oxygen poor and carbon dioxide rich
Term
what is external respiration?
Definition
gas exchange across the respiratory membrane in the lungs
Term
Partial pressure is directly proportional to both
Definition
concentration and pressure
Term
Why is the small amount of dissolved oxygen important for oxygen transport?
Definition
oxygen must be dissolved in plasma before it can go to a red blood cel
Term
what is tidal volume?
Definition
amount of air inhaled or exhaled during resting conditions (TV) we are at rest when we watch tv
Term
what is vital capacity?
Definition
the maximum amount of air that can be forced out after a maximum inspiratory effort. VC
Term
what is residual volume?
Definition
amount of air remaining in lungs after a forceful expiration
Term
what is total volume capacity?
Definition
maximum amount of air contained in the lungs after a maximum inspiratory effort
Term
Which of the following are the hairs within the nasal cavity that filter coarse particles, such as pollen and dust, from inspired air
Definition
vibrassae
Term
is the inflammation of the nasal mucosa accompanied by excessive mucus production, nasal congestion, and postnasal drip.
Definition
rhinitis
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