Which of the following areas of the conduction system would produce spontaneous action potentials most frequently if the SA node were not functioning?
A. AV bundle
B. Purkinje fibers
C. AV node
D. bundle branch
E. the pacemaker
C
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Which of the following is a muscle that originates from the zygomatic arch and functions in elevating the mandible?
A) masseter B) frontalis C) digastric D) temporalis E) medial pterygoid
Compact bone is organized into bony columns called ________
A) osteons B) lamellae C) canaliculi D) lacunae
A nerve cell releases chemical messengers to trigger changes in a nearby muscle cell. This is example of a core principle known as:
A) cell-cell communication. B) feedback loops. C) principle of complementarity of structure and function. D) gradients.
Arteries can constrict or dilate as needed because of the smooth muscle found in the
A. tunica intima. B. tunica media. C. tunica adventitia. D. tunica externa. E. tunica interna.