The letter “C” in the above figure represents the
a. style.
b. ovary.
c. stigma.
d. anther.
e. filament.
Answer: c
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The normal microbiota provides protection against potentially harmful organisms and stimulates the immune system. Why would the immune responses to members of the normal microbiota cross-react with pathogens?
A. Because one person's normal microbiota is another person's pathogen-when we pick up "normal" microbes from a different person, they will always cause infection within us. B. Because pathogens are oftentimes more virulent strains of our own normal microbial microbiota, so they will "look" roughly the same to our immune system (and be acted upon by our immune responses). C. Because the normal microbiota keeps the adaptive immune responses tuned up, active, and ready to respond to broad, general categories of microbes (i.e., Gram-positive vs. Gram-negative microbes, viruses, etc.). D. Because the immune system is a "use it or lose it" system. If it isn't used on a regular basis, we completely lose the ability to respond to pathogens. The normal microbiota keeps the system going so that it can be ready to respond to such pathogens when we're exposed to them.
Blood usually continues on from capillaries to
enter ____ in its travel through the human body. a. arterioles b. venules c. arteries d. veins e. other capillaries
Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in alveoli?
A) 100 mm Hg B) 80 mm Hg C) 46 mm Hg D) 40 mm Hg E) 160 mm Hg
The ventilation of insect tracheal tubes is dependent upon the presence of:
a. pores. b. alveoli. c. gills. d. spiracles. e. opercula.