Exam 48: Gas Exchange

During an episode of hyperventilation, a person breathes very deeply and rapidly, which removes large amounts of CO₂ from the person's blood.Following hyperventilation, the person's breathing temporarily stops.What could explain this?

Which statement about myoglobin is true?

The Everest Base Camp in Nepal is about 5,400 meters above sea level, where the atmospheric pressure is about half of what it is at sea level.If not accustomed to this altitude a person can feel tired and experience shortness of breath upon exertion because

Refer to the figure showing various gas exchange systems.Recall that Fick's law of diffusion is Q = DA(P₁ - P₂)/L. The term D in the equation for Fick's law of diffusion depends in part on the _______, indicating that this term is higher for the diffusion of O₂ in the organism(s) shown in _______.

If a planet were discovered where the atmospheric pressure was 2,000 mm Hg at sea level and the air was 15% O₂, the partial pressure of its O₂ at sea level would be

Refer to the figure. Curve A corresponds to _______ pressure and curve B corresponds to _______ pressure.The graph indicates that exhalation requires _______ relative to atmospheric pressure.

Refer to the figure showing a region in the human lung. Surfactant can be found along the surface labeled _______, which is in an alveolus of the lung and serves to decrease the work necessary to inflate the lungs.

A patient who has chronic obstructive pulmonary disease from having been a smoker for a number of years is tested for lung volume.It is determined that the patient's tidal volume is 0.6 liters, his inspiratory reserve volume is 2.6 liters, his expiratory reserve volume is 1 liter, and his residual volume is 3.2 liters.Prior to smoking, this man's tidal volume was 0.5 liters, his inspiratory reserve volume was 3.1 liters, his expiratory reserve volume was 1.2 liters and his residual volume was 1.2 liters.These numbers indicate that

_______ branch off the parabronchi of bird lungs and serve as sites of gas exchange.

Humans often have difficulty breathing at high elevations primarily because the _______ than it is at low elevations.

Christopher Reeve, the actor best known for his role in superman, was in a riding accident that seriously injured his _______, which left him unable to breathe on his own and required him to be on a ventilator for the rest of his life.

Which statement about human fetal hemoglobin is true?

Which statement is true?

Which characterizes a right shift in the O₂-binding/dissociation curve of hemoglobin?

Choose the correct pairing between aquatic animal and type of gill:

The rate of gas exchange in mammals is maximized by

Refer to the graph showing ventilation rates in a human. Based on the graph, it would take a drop in arterial PO₂ from 100 mm Hg to about _______ mm Hg to bring about the same change in ventilation rate as an increase in arterial PCO₂ from 40 mm Hg to 60 mm Hg.

Which statement regarding diffusion of gases is true?

Refer to the figure. Which organism is an aquatic invertebrate that lacks a specialized respiratory system, and how does it compensate for this?

The gills of fishes exhibit _______ exchange.