Which of the following nerves innervates the diaphragm?
a. Glossopharyngeal
b. Phrenic
c. Seventh cranial
d. Vagus
ANS: B
Functionally, the diaphragm is divided into a right and left hemidiaphragm. Each hemidiaphragm is innervated by a phrenic nerve that arises from branches of spinal nerves C3, C4, and C5.
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Which of the following occurs during the onset of inspiration?
A) Intrathoracic pressure increases and venous return to the heart is impeded. B) Intrathoracic pressure increases and venous return to the heart is facilitated. C) Intrathoracic pressure decreases and venous return to the heart is impeded. D) Intrathoracic pressure decreases and venous return to the heart is facilitated.
A collection letter containing stronger wording that asks the patient to specify when the amount will be paid and to contact the office to make payment arrangements may be sent when an account is ________ days past due.
A. 90 B. 120 C. 60 D. 15 E. 30