16 Questions
Which of the following is a major component of respiration?
Diffusion of oxygen between alveoli and blood
What is the main function of pulmonary ventilation?
Provide oxygen to the tissues
How are the lungs expanded during normal quiet breathing?
By downward movement of the diaphragm
What causes the compression of the lungs and expulsion of air during expiration?
Relaxation of the diaphragm and elastic recoil of the lungs
What causes the increase or decrease in the anteroposterior diameter of the chest cavity?
Elevation or depression of the ribs
Which muscle is primarily responsible for normal quiet breathing?
Diaphragm
Which muscle is the most important for raising the rib cage during inspiration?
External intercostals
What is the main function of the abdominal recti muscles during expiration?
Pulling downward on the lower ribs
During normal inspiration, what happens to the pleural pressure?
Becomes more negative
What is the normal pleural pressure at the beginning of inspiration?
-5 centimeters of water (cm H2O)
What does alveolar pressure decrease to during normal inspiration?
-1 cm H2O
What forces the 0.5 liter of air out of the lungs during expiration?
+1 cm H2O alveolar pressure
Which muscles are classified as muscles of expiration?
Abdominal recti
What is the function of the internal intercostal muscles?
Depress the chest cage
What is the role of the abdominal muscles during heavy breathing?
Compressing the lungs
What maintains a slight suction between the visceral surface of the lung pleura and the parietal pleural surface of the thoracic cavity?
Lymphatic channels suction
Test your knowledge about the main functions of respiration, including providing oxygen to the tissues and removing carbon dioxide. Explore the components of respiration including pulmonary ventilation, diffusion of oxygen and carbon dioxide, and transport of gases in the blood and body fluids.
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