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Pulmonary Ventilation and Respiration Functions

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Pulmonary Ventilation and Respiration Functions

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Questions and Answers

Which of the following is a major component of respiration?

Diffusion of oxygen between alveoli and blood (correct)

Transport of nutrients in the blood

Digestion of food in the stomach

Regulation of heart rate

What is the main function of pulmonary ventilation?

Regulate heart rate

Provide oxygen to the tissues (correct)

Transport CO2 in the blood

Digest food in the stomach

How are the lungs expanded during normal quiet breathing?

By elevation of the ribs

By downward movement of the diaphragm (correct)

By upward movement of the diaphragm

By contraction of the chest wall muscles

What causes the compression of the lungs and expulsion of air during expiration?

Relaxation of the diaphragm and elastic recoil of the lungs Signup and view all the answers

What causes the increase or decrease in the anteroposterior diameter of the chest cavity?

Elevation or depression of the ribs Signup and view all the answers

Which muscle is primarily responsible for normal quiet breathing?

Diaphragm Signup and view all the answers

Which muscle is the most important for raising the rib cage during inspiration?

External intercostals Signup and view all the answers

What is the main function of the abdominal recti muscles during expiration?

Pulling downward on the lower ribs Signup and view all the answers

During normal inspiration, what happens to the pleural pressure?

Becomes more negative Signup and view all the answers

What is the normal pleural pressure at the beginning of inspiration?

-5 centimeters of water (cm H2O) Signup and view all the answers

What does alveolar pressure decrease to during normal inspiration?

-1 cm H2O Signup and view all the answers

What forces the 0.5 liter of air out of the lungs during expiration?

+1 cm H2O alveolar pressure Signup and view all the answers

Which muscles are classified as muscles of expiration?

Abdominal recti Signup and view all the answers

What is the function of the internal intercostal muscles?

Depress the chest cage Signup and view all the answers

What is the role of the abdominal muscles during heavy breathing?

Compressing the lungs Signup and view all the answers

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 Signup and view all the answers