True or False? Calcitonin reduces blood calcium levels.
Answer the following statement true (T) or false (F)
True
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Select the correct statement about the function of antibodies.
A) Antibodies may directly destroy "invaders." B) Neutralization is the process by which antibodies cause invading cells to clump together. C) Complement fixation is the main mechanism by which antibodies provide protection. D) The most potent agglutinating agent is IgG.
Microglia are phagocytic cells delivered by the blood to the central nervous system
Indicate whether the statement is true or false
The adaptive significance of the crossed extensor reflex when a person steps on a tack is to
A. remove the foot from the tack. B. increase the rate at which withdrawal of the limb occurs. C. slow the rate of removal of the foot from the tack. D. reduce the pain sensations. E. prevent the person from falling down.
Which of the following muscles is inferior to the lips?
A) masseter B) risorius C) depressor anguli oris D) frontalis E) zygomaticus major