Variation in which of the following is not a major mechanism for regulation of blood pressure?
1.cardiac output
2.constriction of blood vessels
3.pacemaker signal strength
4.total blood volume
3
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Which of the following bacterial pathogens is found in water distribution systems?
A) Enterobacter aerogenes B) Klebsiella pneumoniae C) Legionella pneumophila D) Vibrio cholerae
Why does countercurrent exchange optimize gas exchange across some gills?
a. It sustains an optimal thermal environment for gas exchange. b. It optimizes perfusion to the respiratory surface. c. It sustains an optimal respiratory gas concentration gradient, allowing diffusion to occur across the entire respiratory surface. d. It optimizes delivery of the respiratory medium to the respiratory surface. e. It minimizes diffusional area.
Gene therapy
a. has not yet been used successfully with mammals. b. is a surgical technique that replaces defective genes with normal genes. c. has been used successfully to treat victims of autosomal dominant disorders by replacing the dominant allele with a recessive allele. d. is a genetic engineering technique that replaces defective alleles with normal ones. e. is none of these.
Norovirus is the leading cause of viral gastroenteritis in the United States.
Answer the following statement true (T) or false (F)