Which of the following statements best describes a stem cell?
A. An undifferentiated cell that can divide to yield specialized cells in a tissue
B. An antibody not directed against the causative organism but produced during the disease
C. A cell that attracts a basic blue stain in the laboratory
D. A cell that is formed in the presence of a large number of mononuclear leukocytes
E. Another term for a white blood cell
Answer: A
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The pleura is a double-layered membrane that forms a protective sac around the lungs
Indicate whether the statement is true or false
Visual tracking skills usually occur at what age level?
A. in middle school B. by the end of first grade C. later elementary school years D. Preschool or Kindergarten
Neurotransmitters are considered to be the basic working units of the brain
a. True b. False Indicate whether the statement is true or false
Which of the following is the most effective means that the body has to dissipate heat when the temperature and radiant heat of the environment are higher than the body temperature?
A. Conduction B. Evaporation C. Convection D. Radiation