How has the avian lung adapted to the metabolic demands of flight?
A) Airflow through the avian lung is bidirectional like in mammals.
B) There is more dead space within the avian lung so that oxygen can be stored for future use.
C) Countercurrent circulation is present in the avian lung.
D) Gas exchange occurs during both inhalation and exhalation.
D
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The muscular tube leading from the pharynx to the stomach is the
A. larynx. B. trachea. C. esophagus. D. glottis. E. bronchus.
A declining population is indicated by
a. A. b. B. c. C. d. D. e. none of these.
The spinal cord ____
a. functions as a control center for reflexes b. inhibits unwanted brain activity c. consists solely of nerve tracts d. carries only motor information e. carries parasympathetic but not sympathetic messages
Which of the following characteristics can be found in all fish? Select all that apply.A) Nutritional deficienciesB) JawsC) LungsD) BonesE) Vertebral column
What will be an ideal response?