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Respiratory Question

Where does the conducting portion of the respiratory system begin? at the entrance to the nasal cavity
Respiratory surfaces of the nasal cavity are cleared by mucus produced by the respiratory mucosa and produced in the paranasal sinuses of which bones? frontal, sphenoid, ethmoid, and maxillary
Posterior support to the larynx is provided by which of the following? the cricoid cartilage
Why are children's voices high-pitched? The larynx is smaller with slender, short vocal cords.
Through which parts of the pharynx do food and drink normally pass during ingestion? oropharynx and laryngopharynx only
Where do terminal bronchioles branch into respiratory bronchioles? within a lobule
Each lung contains about how many alveoli? 150 million
What cells are known as dust cells? alveolar macrophages
Which portion of both lungs has grooves that mark the passage of large blood vessels and indentations of the pericardium? mediastinal surface
Surfactant, which prevents alveolar collapse, is produced by which cells? septal cells (pneumocytes type II)
The amount of air that remains in the lungs after a maximal exhalation is the The amount of air that remains in the lungs after a maximal exhalation is the
Blood in the veins of the pulmonary circuit has a relatively high partial pressure of ________ and relatively low partial pressure of ________. O2, CO2
At which point does thoracic cavity volume decrease and pressure inside rise? during exhalation
Which of the following is not a component of vital capacity? residual volume
Which muscles act to lower the rib cage? internal intercostals and rectus abdominis
Which of the following gases has the lowest partial pressure in inhaled air? Carbon Dioxide
Nearly all the oxygen in the blood is carried attached to iron atoms in the heme units of hemoglobin.
What happens to the majority of carbon dioxide molecules in plasma? They are diffused into erythrocytes
Which of the following statements is true regarding internal respiration? Diffusion between the systemic capillaries and interstitial fluid decreases the pO2 of blood and increases its pCO2
What occurs when the pH of interstitial fluid declines? Hemoglobin molecules release their bound oxygen molecules more readily.
If peripheral tissue becomes more active, pO2 falls and pCO2 rises
In which of the following is an expiratory center found? in the ventral respiratory group
Which of the following factors will reduce the respiratory rate? decreased body temperature
Which system transports carbon dioxide as bicarbonate ions, which helps the buffering capability of blood against pH changes? cardiovascular system
Which of the following statements is true regarding chemoreceptors? Aortic bodies are sensitive to pH, pCO2, and pO2 in arterial blood.
Which of the following statements regarding gas transport is true? Erythrocytes take up dissolved O2 and CO2 from plasma and either bind them or manufacture soluble compounds.
Created by: kcopeland10