A condition in which a person's airways become inflamed, narrow, swell and produce extra mucus, which makes it difficult to breathe is known as

1.	Asthma
2.	Emphysema
3.	Chronic bronchitis
4.	Chronic obstructive pulmonary disease

The part of the human brain where the main respiratory center is located is:

The respiratory center in humans can be primarily stimulated by:
1. carbon dioxide and hydrogen ions
2. oxygen gas levels in the blood
3. oxygen gas levels in the hemoglobin
4. conscious feeling for the need for more oxygen

With respect to the atmospheric air, the deoxygenated blood flowing into lung capillaries has a higher concentration of:

Why would hemoglobin deliver oxygen to the tissues?
1. oxygen concentration of tissue fluid is lower
2. carbon dioxide concentration of tissue fluid is lower
3. carbon dioxide concentration of tissue fluid is higher
4. the oxygen concentration of blood is lower

Hemoglobin carrying carbon dioxide is called as:

A measure of the amount of air a person inhales during a normal breath is:

The amount of air that remains in a person's lungs after fully exhaling is known as:

Carbon dioxide is transported in blood by all the following mechanisms except:
1. bound to the protein portion of hemoglobin
2. bound to the iron atoms of hemoglobin
3. dissolved in plasma
4. as bicarbonate

The pulmonary function of a person reveals the following values:
a. tidal volume = 500 mL
b. residual volume = 1000 mL
c. inspiratory reserve volume = 2500 mL
d. expiratory reserve volume = 1000 mL
His vital capacity is