The normal pacemaker of the heart is the
A. atrioventricular node.
B. Purkinje fibers.
C. sinoatrial node.
D. AV bundle.
Answer: C
Anatomy & Physiology
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Which model most accurately represents the current view of the structure of the atom?
What will be an ideal response?
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ACh binds to ________ receptors on cardiac muscle, smooth muscle, and gland cells.
Fill in the blank(s) with the appropriate word(s).
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The glial cell that myelinates and insulates axons in the peripheral nervous system is the
A. astrocyte. B. ependymal cell. C. neurolemmocyte. D. microglial cell. E. oligodendrocyte.
Anatomy & Physiology
Which movements are possible at hinge joints?
A) rotation and circumduction B) adduction and abduction C) pronation and supination D) flexion and extension E) rotation and adduction
Anatomy & Physiology