When the diaphragm or external intercostal muscles contract, intrapulmonary pressure should

1.	increase	2.	decrease
3.	remain constant	4.	equal atmospheric pressure

When air leaks into the space between lung and chest wall, the result can be:
1. pneumothorax and atelectasis
2. hydrothorax and hemothorax
3. empyema and emphysema
4. pneumonitis and effusion

Air conditioning – warming, humidifying and filtering of the air, is the function performed by:

During deglutition, the food is prevented from entering into the larynx by the cartilaginous:

The trachea divides into two primary bronchi where the right with respect to the left is:
1. wider
2. longer
3. more horizontally oriented
4. all of the above

The diffusion of gases in lungs occur across the respiratory membrane. Which of the following is incorrect regarding the respiratory membrane?
1. it is the only barrier between the blood and the inhaled gases within each alveolus
2. basement membranes of alveolar type I cells and their adjacent capillaries are fused
3. oxygen cannot diffuse through the membrane and so must be actively transported
4. carbon dioxide diffuses across the membrane from the blood into the alveolar lumen

In normal resting respiration, the active and passive processes respectively are:
1. inhalation, exhalation
2. exhalation, inhalation
3. expiration, inspiration
4. eupnea, hyperpnea

Trachea is invested with incomplete cartilaginous rings. They:
1. serve as a point of attachment for some muscles of expiration.
2. support muscular attachments to the thyroid cartilage and epiglottis.
3. prevent the trachea from collapsing.
4. attach the trachea to the esophagus posteriorly.

Alveoli in the lungs are lined by:
1. a simple squamous epithelium.
2. a pseudostratified ciliated columnar epithelium.
3. a simple cuboidal epithelium.
4. a transitional epithelium.

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of
1. Residual Volume (RV)
2. Inspiratory Reserve Volume (IRV)
3. Tidal Volume (TV)
4. Expiratory Reserve Volume (ERV)