The middle ear cavity is connected to the nasopharynx by:

1.	auditory tubes	2.	internal nares
3.	nasolacrimal ducts	4.	paranasal sinuses

The most negative pressure at the end of normal inspiration would be:

The volume of air that is available for gas exchange each minute is the
1. minute ventilation
2. anatomical dead air space
3. physiological dead air space
4. alveolar ventilation

The respiratory system does not:
1. allow oxygen from the air to enter the blood and carbon dioxide to leave the blood and enter the air.
2. alter the pH by changing oxygen levels.
3. provide protection against some microorganisms by preventing their entry into the body and by removing them from respiratory surfaces.
4. allow for speech and sound generation.

The dorsal respiratory group of the respiratory center in the brain stem stimulates:

Condition of the body in which the tissues are starved of oxygen is called as:

Oxygenated blood through the tissues of the lungs is carried by:
1. pulmonary and bronchial veins
2. pulmonary and bronchial arteries
3. pulmonary veins and bronchial arteries
4. pulmonary arteries and bronchial veins

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

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

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)