The trachea divides into a right and a left primary bronchus at the level of:

1. 2nd thoracic vertebra	2. 3rd thoracic vertebra
3. 5th thoracic vertebra	4. 12th thoracic vertebra

Regarding pulmonary capacities, the maximum volume of air a person can breathe in after a forced expiration can also be defined as:
1. Total volume of air a person can inspire or expire after a normal inspiration or expiration
2. Volume of air that will remain in the lungs after a normal expiration
3. Maximum volume of air a person can breathe out after a forced inspiration
4. Total volume of air accommodated in the lungs at the end of a forced inspiration

The binding of oxygen with hemoglobin is primarily related to:

Under normal physiological conditions, what amount of oxygen is delivered to the tissues?

Pneumotaxic center:

Pulmonary fibrosis is a pathological hallmark of:
1. Chronic obstructive lung disease
2. Bronchial asthma
3. Viral Pneumonia in children
4. Occupational lung diseases

The peripheral chemoreceptors are:
1. more sensitive to a decrease in ${\mathrm{PCO}}_2$ than to a decrease in ${\mathrm{PO}}_2$
2. stimulated by hypocapnia
3. located in the medulla oblongata of the brain stem
4. more sensitive to a decrease in ${\mathrm{PO}}_2$ than to a decrease in ${\mathrm{PCO}}_2$

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

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

A minimal amount of pleural fluid present in the pleural cavity: