Maggie was told she has a positive titer to measles. Which of the following could explain this?
A.) She was vaccinated against measles.
B.) She had measles sometime in her life.
C.) She has measles now.
D.) The test was a false positive.
E.) All of these choices are correct.
E.) All of these choices are correct.
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From which chamber of the heart does the right ventricle receive blood?
(a) right atrium. (b) left atrium. (c) left ventricle. (d) none of the above.
Which of these symptoms occur with periodontitis?
A) loosening of the teeth B) inflammation of the gums C) loss of bone in the tooth socket D) dental caries or cavities
The primary breathing control centers in the brain are located in the ______.
A. cerebral cortex B. hypothalamus C. medulla D. pituitary
What would you find in the heart of an amphibian?
A. two atria and one ventricle B. two atria and two ventricles C. two atria and a partially divided ventricle D. one atrium and one ventricle E. one atrium and two ventricles