Which is TRUE regarding the regulation of heart rate?
A. Stimulation of parasympathetic nerves to the heart causes a slowing of heart rate.
B. Stimulation of sympathetic nerves to the heart causes an increase in heart rate.
C. A person whose heart lacks autonomic innervation has a faster heart rate at rest than a person with a normally innervated heart.
D. The slope of diastolic depolarization in SA node cell action potentials determines the heart rate.
E. All of the choices are true.
E
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The inability to control the expulsion of urine is called ________.
Fill in the blank(s) with the appropriate word(s).
Flexion and extension usually occur along which plane?
a) Frontal b) Transverse c) Sagittal d) Oblique e) None of these choices
In the lungs, surfactant is secreted by ____ cells.?
a. beta b. parietal c. alveolar d. alpha
Which of the following promotes the depolarization stage?
A) hydrolysis of ATP B) closure of voltage-gated sodium ion channels C) opening of voltage-gated sodium ion channels and sodium ions enter the cell D) opening of voltage-gated potassium ion channels and potassium ions exit the cell