Crows are notorious nest robbers, stealing eggs from the nests of passerine birds, and they will even eat other birds if they can catch them
Adult passerines attack crows that approach their nests, darting at them and pursuing them when they fly away. What anatomical difference in the wings of passerines and crows might allow passerines to engage in such seemingly risky behavior?
Many passerines, though not all species, move through dense vegetation, turning and twisting as they fly. They have elliptical wings, whereas the wings of crows have a shape closer to the wings of soaring birds. As a result, passerines are more maneuverable than crows and can dart in and out with little risk.
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Which of the following statements about the cauda equina is true?
A. It is a bundle of nerve fibers that occupies the vertebral canal from L2 to S5. B. It is synonymous with the medullary cone. C. It is part of the lumbar enlargement. D. It is a bundle of connective tissue fibers that extends from the medullary cone. E. It innervates structures of the anterior and medial thigh.
Diapedesis is the means by which a leukocyte reproduces
Indicate whether the statement is true or false
During the alarm phase of the general adaptation syndrome (GAS), there is
A) decreased blood flow to skeletal muscles and skin. B) decreased mental alertness. C) mobilization of energy reserves. D) increased urine release. E) decreased rate of respiration.
A hormone called ________ plays an important role in incubating a special group of white blood cells.
A) cortisol B) thymosin C) glucagon D) melatonin