Percutaneous lung aspirate is:
a. acceptable.
b. not acceptable.
A
Because indigenous anaerobes are often present in large numbers as normal flora on mucosal surfaces, even minimal contamination of a specimen can give misleading results. Respiratory secretions that pass through the upper respiratory tract will likely be contaminated with upper respiratory tract flora, but those that are collected in such a way that protects the specimen are acceptable.
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One key principle of natural selection is that there is competition for resources
A. true B. false
The amount of infecting agent received by susceptible individuals is called the infectious
A. exposure. B. number. C. dose. D. level.
Precipitation reactions between antigens and antibodies are characterized by
A. Appearance of IgE in the immune system B. Formation of a structure called a lattice C. Inhibition of the complement system D. Destruction of the available red blood cells
This type of mechanoreceptor is found in the lips, nipples, and fingertips and helps us to precisely determine contact with something else
A) free nerve endings B) Pacinian corpuscles C) Meissner's corpuscles D) hair root plexus