description of the similarities and differences between the two types of action potentials(the action potentials of an SA node cell and the action potentials of a cardiac muscle cell) ?

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Collen VonLv2

21 Dec 2018

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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

3. What are the major ions that contribute to membrane potential and how are they distributed across the plasma membrane? How are the concentration differences maintained? What is an action potential and what cell types are likely to experience action potentials?

You are recording action potentials in a nerve cell in a petri dish in the laboratory. The only difference between your setup in the lab and the normal condition in the body is that the cell is now surrounded by a solution that has a higher concentration of sodium ions than normal. What are you most likely to observe?

A. The resting membrane potential is more hyperpolarized than in the body

B. The action potentials peak at a lower voltage than in the body

C. The action potentials peak at a higher voltage than in the body

D. A and B are both correct