Biology

18. The function of neurons is to
a. maintain a difference in electrical charge across the cell membrane
b. have specific ions cross the membrane through ion channels
c. maintain a membrane potential with charged ions on either side of the cell membrane
d. all of the above
D?

19. When an impulse moves down the axon,
a. sodium ions first rush out of the cell
b. a small part of the axon momentarily reverses its polarity
c. the resting potential of the cell does not change
d. potassium ions are pumped into the axon
Not sure...?

24. The brain stem is responsible for
a. directing information in the brain and secreting hormones
b. regulating vital functions and memory
c. motor processing and regulating homeostatic functions
d. sensory processing and regulating balance
I'm stuck between A and C

29. Thyroid hormones
a. stimulate cell metabolism and growth
b. slow growth of their target cells
c. stimulate synthesis of DNA
d. bind to receptor molecules on the target cell's surface
A?

Thanks
-MC

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asked by mysterychicken
  1. 18. D
    19. B
    24. C
    29. A

    All of these are to the best of my knowledge, but I am pretty sure they are correct. Hope this helps!!

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    posted by Natalie

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