During which part of the bird respiratory cycle is O2 NOT extracted from the air?
a. the first inhalation
b. the first exhalation
c. the second inhalation
d. the second exhalation
e. the third exhalation
E
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Maximum force is generated by a muscle contraction when:
A. the myofibril is stretched. B. there is excessive overlap between actin and myosin. C. the sarcomere is at intermediate length prior to initiation of contraction. D. intracellular calcium levels are low.
The first heart sound (lub) is produced by the closing of the ____ and ____ valves
a. aortic semilunar; pulmonary semilunar b. right atrioventricular; aortic semilunar c. left atrioventricular; pulmonary semilunar d. right atrioventricular; left atrioventricular e. mitral; left atrioventricular
What are the three animal phyla that dominate animal life on land?
A. Cnidaria, Mollusca, Platyhelminthes B. Nematoda, Chordata, Cnidaria C. Platyhelminthes, Nematoda, Arthropoda D. Mollusca, Arthropoda, Chordata E. Porifera, Arthropoda, Nematoda
Microorganisms characterized by the absence of a nucleus are called
A) fungi. B) pathogens. C) eukaryotes. D) prokaryotes. E) viruses.