Which of the choices below is the parent cell for all formed elements of blood?
A) megakaryocyte
B) NK cell
C) pluripotent stem cell (hemocytoblast)
D) polymorphonuclear cell
C) pluripotent stem cell (hemocytoblast)
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The instrument used to examine the ear is the:
A) ophthalmoscope B) auricloscope C) pinnoscope D) otoscope
An excess of hydrogen ions in the body fluids can have fatal results because this can
A) block ion movements. B) change the shape of large complex molecules, rendering them nonfunctional. C) disrupt tissue functions. D) All of the answers are correct. E) None of the answers is correct.
Which of the following is the correct pathway of the electrical impulses of the conducting system of the heart?
A. SA node ? AV node ? AV bundle ? AV branch ? Subendocardiac conducting network B. SA node ? AV bundle ? AV node ? AV branch ? Subendocardiac conducting network C. SA node ? AV node ? AV branch ? AV bundle ? Subendocardiac conducting network D. AV node ? SA node ? AV bundle ? AV branch ? Subendocardiac conducting network
Which of the following is a primary lymphatic organ?
A. Thymus B. Tonsil C. Spleen D. Lymph node