Gas Exchange

Temperature dramatically effects gas exchange in aquatic ectothermic animals because

• Metabolism requires more energy at higher temperatures, however, at higher temperatures oxygen is less soluble
  in water.

• Metabolism requires less energy at higher temperatures, however, at higher temperatures oxygen is less soluble
  in water.

• Metabolism requires more energy at higher temperatures, however, at higher temperatures oxygen is more
  soluble in water.

• None of the above are correct, temperature has little effect on gas exchange

Gases always move from a lower partial pressure to a higher partial pressure.

• True

• False

_______ allows birds to maintain high rate of metabolism even when PO2 is very low.

• Abdominal pumping

• Unidirectional ventilation

• Tidal air-flow in and out of lungs

• None of the above are correct.

Which of the following is not a respiratory organ or surface for gas exchange?

• Gills

• Lungs

• Diaphragm

• Trachae

The total pressure exerted by a mixture of gases is the sum of pressures exerted by each gas.

• True

• False

In humans the respiratory surface in the lungs are the

• bronchi.

• bronchioles.

• lamellae.

• alveoli.

• filaments

Oxygen is essential for animals because

• it is used to break chemical bonds.

• it is the final electron acceptor in the electron transport chain of cellular respiration.

• it expands the volume of our bodies.

• it is the final electron donor in the electron transport chain of cellular respiration.

In vertebrates the respiratory pigment that transports the majority of oxygen through the body is

• hemoglobin.

• red blood cells.

• myoglobin.

• hemocyanin.

Which of the following make it more difficult for animals to extract oxygen from water rather than
air.

• The oxygen content of air is higher than in water.

• It takes more energy to move water than air.

• Water is more dense than air.

• All the above are correct.

• None of the above are correct

Which of the following does not influence oxygen binding and dissociation?

• Hemoglobin composition/structure.
  Blood pH.

• Amount of BPG in red blood cells.

• Amount of carbon dioxide dissolved in the blood.

• None of the above are correct because they all influence oxygen binding to hemoglobin.