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.

Name the cavities in which the lungs are located:
1. pleural and abdominal cavities.
2. pericardial and thoracic cavities.
3. pleural and thoracic cavities.
4. pleural and pericardial cavities.

What is the term and value for the maximum amount of air a person can expel from the lungs after a maximum inhalation?

1. vital capacity, 4600
2. total lung capacity, 5800
3. inspiratory reserve volume, 3000
4. inspiratory capacity, 3500

Under normal resting conditions, the amount of air that is actually available for exchange of gases is approximately:
1. 150 ml
2. 350 ml
3. 500 ml
4. 650 ml

A person has a respiratory rate of 12 breaths per minute and an anatomical dead space of 150 ml. How much air is not involved in gas exchange per minute?
1. 500 mL/min
2. 1800 mL/min
3. 4200 mL/min
4. 6000 mL/min

What is the partial pressure of oxygen and carbon dioxide respectively in the venous blood leaving the tissues [in mm of Hg]?

Why is oxygen transport affected in carbon monoxide poisoning?

1. More carbonic acid will be produced, and the hemoglobin will give up more oxygen to the tissue.

2. Hemoglobin will bind to less oxygen, and hemoglobin will not release as much oxygen to the tissue.

3. Carbon monoxide makes hemoglobin give up oxygen more readily in the tissues.

4. Carbon monoxide ties up hemoglobin's ability to bind to oxygen, but more hemoglobin will be produced, so no decline in oxygen in the tissue will be noticed.

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:

Some pathogens can reach the alveoli, they can still be destroyed by:

1. macrophages in the pulmonary lymph nodes
2. NK cells in the elastic tissues of the lungs
3. cytotoxic T-lymphocytes
4. alveolar macrophages