Compare and Contrast the Neuronal Action Potential vs Cardiac Action Potential. Focus on the STEPS (depolorization,...

Compare and Contrast the Neuronal Action Potential vs Cardiac Action Potential. Focus on the STEPS (depolorization, refractory period repolorization, Na/K pumps, resting membrane potential, ect...) of the both action potentials and identify the difference(s).
What is the significance and involvement of Calcium ions in the cardiac action potentials? Why are Calcium ions not necessary in the neuronal action potentials, but are essential in the myocardial AP?

Solutions

Expert Solution

The major difference between neuronal action potential and cardiac action potential is duration of action potentials.In a typical nerve the action potential is about 1ms.In skeletal muscle,the action potential duration is approximately 2-5ms.In cardic the action potential range from 200 to 400ms.

Another difference between Cardiac and nerve and muscle action potential is the role of calcium ions in depolarization.The depolarization phase of action potential is causes by opening of sodium channels in nerve and muscle cells.

Ions channels have two fundamental properties.Ion permeation and gating.Four ion permeation decsribes the movement through the open channel.The selective permeability of ion channels to specific ions is a basis of classification of ion channels examples Na+,K+,Ca+2 channels.Size , valency and hydration energy are important determinants of selectivity.Biologically important alkali cations have have high selectivity ratio.

Example 10:1 is the selectivity ratio of sodium channels Na+:K+.

Sydney Mullin answered 9 months ago

Next > < Previous

Related Solutions

Compare and Contrast the Neuronal Action Potential vs Cardiac Action Potential. Focus on the steps of...

Compare and Contrast the Neuronal Action Potential vs Cardiac Action Potential. Focus on the steps of the both action potentials and identify the difference(s). What is the significance and involvement of Calcium ions in the cardiac action potentials? Why are Calcium ions not necessary in the neuronal action potentials, but are essential in the myocardial AP?

Describe the sequence of steps for an action potential of one neuronal cell leads to the...

Describe the sequence of steps for an action potential of one neuronal cell leads to the action potential in a postsynaptic cell.

Compare and contrast a grade potential with an action potential?

Compare and contrast cardiac and skeletal muscle in the following: Cellular structure Excitation-Contraction Coupling Action potential...

Compare and contrast cardiac and skeletal muscle in the following: Cellular structure Excitation-Contraction Coupling Action potential of Skeletal Muscle cells and Cardiac Contractile muscle cells Production of ATP Role of Calcium Mechanisms for increased strength/force of contraction

3. Compare and contrast an action potential and a local post-synaptic potential in terms of where...

3. Compare and contrast an action potential and a local post-synaptic potential in terms of where they occur on a neuron, the change in charge, how they propagate through a neuron. (3) 6. What is an EPSP and IPSP? Provide a definition, not just spelling out the acronym. (2) Provide a specific example of how each can be generated in a neuron. (4) 8. Imagine humans have a single hypothetical neuron that controls the decision to get out of bed....

compare and contrast the phases and ionic events that produce an action potential in a contractile...

compare and contrast the phases and ionic events that produce an action potential in a contractile cardiomyocyte from an action potential in the specialized conduction tissue like a sino-atrial nodal cell

Compare and contrast cardiac and skeletal muscle in terms of electrical stimulus and action potentials (excitation-contraction...

Compare and contrast cardiac and skeletal muscle in terms of electrical stimulus and action potentials (excitation-contraction coupling), role of calcium, energy use and production, and ways to develop increased force of contraction. How does the vulnerability of the myocardium relate to the fact that heart disease is the leading cause of death?

Compare and contrast graded potential and action potentials (explain these concepts in terms of anatomical and...

Compare and contrast graded potential and action potentials (explain these concepts in terms of anatomical and physiological characteristics)

Compare and contrast the action of epinephrine vs glucagon binding and signaling from its target GPCR...

Compare and contrast the action of epinephrine vs glucagon binding and signaling from its target GPCR in order to regulate glucose metabolism under stress vs rest conditions.

Draw and label the action potential. Indicate steps 1-7 at each point of the Action Potential....

Draw and label the action potential. Indicate steps 1-7 at each point of the Action Potential. Then tell me what happens at each point. Tell me why it is important to know the steps of the Action Potential and how it works, and what it does in the body.

Subjects