Which of the following is correct?
a. norepinephrine and acetylcholine have opposite effects on the activity of ion channels in pacemaker cells
b. norepinephrine increases the slope of pacemaker potentials leading to increased heart rate
c. acetylcholine increases the duration of diastole
d. all of the above
Answer: d. all of the above
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Imagine a genetic mutation that resulted in a malfunctioning inactivation gate in a voltage-gated sodium channel. The defective gate wouldn't always open and close when it should. What functional problems would this cause for the neurons?
What will be an ideal response?
The lobe of the brain that contains the auditory area is the:
a. frontal lobe b. parietal lobe c. occipital lobe d. temporal lobe
With regard to pH levels, ____________________ maintain homeostasis within cells
Fill in the blank(s) with correct word
Which of the following functions is associated with the skin?
A. Vitamin A production B. Lipid production C. Protection against ultraviolet radiation of the sun D. Vitamin C production E. Regulation of body pH