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

The peripheral chemoreceptors in carotid and aortic bodies respond to:
1. hydrogen ion concentration.
2. levels of carbon dioxide in the blood.
3. levels of oxygen in the blood.
4. all of the above

What will happern to the rate and depth of breathing when blood carbon dioxide rises?

Both carbon dioxide and oxygen move across the respiratory membrane due to:

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:

What is the state that describes the hemoglobinic acid?

A disease of the lungs, due to chronic inhalation of dust particles, would be characterized by:

An abnormal collection of air in the pleural space between the lung and the chest wall is called as:
1. intrapleural pressure
2. respiratory distress syndrome
3. pneumothorax
4. decompression sickness