What is the function of the property of automaticity in heart muscle?
A. To initiate an impulse in response to a stimulus
B. To transmit electrical impulses that are received
C. To respond to a stimulus only after repolarization
D. To spontaneously and repetitively initiate an impulse
D
Automaticity refers to the ability of cardiac cells to spontaneously and repetitively initiate an impulse. The initiation of an impulse in response to a stimulus refers to excitability. The trans-mission of electrical impulses that are received refers to the property of conductivity, and the re-sponse to a stimulus only after repolarization refers to refractoriness.
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A) Medicare B) Medigap insurance C) Prospective payment system D) Medicaid
The nurse is teaching a patient who will begin taking bethanechol (Urecholine). Which statement by the patient indicates a need for further teaching?
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Housekeeping genes are vital to the function and maintenance of all the body's cells. What char-acteristic is associated with these genes?
a. They lack encoding histones. b. They are transcriptionally active. c. Ribosomal RNA genes are absent. d. Epigenetic silencing has occurred.
________ lenses are prescribed to correct vision affected by presbyopia.
Fill in the blank(s) with the appropriate word(s).