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1)What stage of meiosis involves the seperation of sisterchromatids?
2) why can an injection of potassium chloride be fatal? (itsomething to do with action potentials)
3) How do reflexes maintain homeostasis?

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Nestor Rutherford
Nestor RutherfordLv2
28 Sep 2019

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Related questions

1.A stronger stimulus to a neuron results in ________.

A. larger voltage changes in graded potentials and greater frequency of action potentials produced in response

B. greater frequency of graded potentials and larger voltage changes in the action potentials produced in response

C. larger voltage changes in the graded potentials, but no changes in action potentials

D. larger voltage changes in both graded and action potentials

E. larger voltage changes in graded potentials but smaller action potentials

2. Why is it more difficult to fire an action potential when the interval between stimuli decreases?

A. because sodium is flowing out of the cell

B. because potassium is flowing into the cell

C. because some sodium channels may still be in an inactivated state

D. because chloride is flowing into the cell

E. because chloride is flowing out of the cell

3. As an action potential zips down an axon,

A. voltage gated potassium channels open first followed by voltage-dependent sodium channels

B. voltage- gated sodium channels ahead of the wave and not yet activated are influenced by the depolarizing electrical field of other nearby sodium channels

C. voltage-gated potassium channels ahead of the wave and not yet activated are influenced by the depolarizing electrical field of nearby sodium channels

D. leak channels are opened by the wave of electricity passing along the axon

E. B and C

Please help

29. The action potential


a. begins with the membrane’s increased permeability to potassium.

b. returns to resting when the sodium channels open.


c. can be triggered by opening of ligand gated Na and K channels.


d. involves voltage-gated Chloride channels in the membrane.


e. can be triggered by opening of voltage gated Na+ and K+ channels.

30. Which of the following is not a step in the propagation of action potentials?


a. Sufficient local inward current causes the axon to reach threshold.


b. Local depolarization/inward current spreads to adjacent axonal regions.


c. Adjacent regions eventually reach threshold and exhibit an action potential waveform.


d. Current/depolarization continue to spread directionally along the axon, repeating steps a–c

e. All of the above are steps contributing to the propagation of action potentials.

31. Which of the following is important for the unidirectional propagation of action potentials?

a. The voltage dependence of the sodium channels


b. The voltage dependence of the potassium channels


c. The presence of a refractory period at a location where an action potential has just fired

d. Sufficient “leakiness” of the axons, such that backward propagation of action potentials is prevented


e. The capacity of axons to function as perfect insulators and prevent current leakage and backpropagation

What are the two effects a neurotransmitter may have on a postsynaptic cell? What are the two potentials that result from each of these effects? Describe why the sum of each potential is important for generating an action potential as well as the ways these potentials can be summed. Why do you think a single excitatory potential is insufficient to produce an action potential?

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