All of the following are true of the SA node EXCEPT that it
A) is the pacemaker. B) is influenced by nerve impulses and hormones.
C) directly stimulates the ventricles. D) directly stimulates the atria.
C
Biology & Microbiology
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Which of the following vitamins is fat soluble?
a. vitamin A c. vitamin C b. vitamin B6 d. all of these
Biology & Microbiology
Which of the following was found to be the
main ozone destroying gas?
a. chlorofluorocarbons b. carbon dioxide c. methylmercury d. methane e. nitrogen
Biology & Microbiology
Leukocytosis-promoting factor, among other things, acts to encourage the movement of white blood cells to the site of an injury. Which hormone opposes this action?
A) epinephrine B) insulin C) TH D) cortisol
Biology & Microbiology
Chromosomes are made out of Euchromatin
a. true b. false
Biology & Microbiology