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.

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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