Question

In: Anatomy and Physiology

Correlate the waves in an electrocardiogram with those of a cardiomyocyte action potential..

Correlate the waves in an electrocardiogram with those of a cardiomyocyte action potential..

Solutions

Expert Solution

In an ECG , there are mainly 3 waves are prresent. They are P wave, QRS complex, T wave

The two main segments are P-R segment and S-T segment

P-R segment ( it is the segment between the end of the P wave and the starting of the QRS complex

S-T segment ( it is the segment between the end of the QRS complex and the beginning of the T wave

In the heart, electrical activity (depolarization and repolarization) proceeds in a sequential order

1)The start for a heart beat arises in the pacemaker cells of the sinoatrial (SA) node located in the right atria.because SA node is a autorhythmic node. From the SA node, the wave of depolarization moves through both atria, resulting in atrial contraction.This atrial contraction or depolarization is represented by the P wave in the ECG

2)The impulse then move through the intranodal pathway connecting the SA node with the atrioventricular node (AV node). At the AV node the impulse slows allowing the atria to contract before the ventricles depolarize.This is called AV nodal delay , it is represented by the P-R segment in the Ecg

The impulse then move from the AV node through specialized conducing tissue known as the Bundle of His. The Bundle of His branches (rightand left) within the septum that separates the ventricles and then into the Purkinje fiber system, which carry the impulse through the ventricular walls. This will produce ventricular contraction ( Ventricular depolarization ) . It is represented by the QRS complex

In ventricular contraction is due to the ventricular action potential

it has mainly 4 phases

The phase 0 is the ventricular depolarization , Here the depolarization is due to the opening of the Na + channel

Phase 1 - early repolarization stage is due to the efflux of the K+ ion through transient outward k+ channel

The phase 0 and phase 1 denote the QRS complex in the ECG

Phase 2 - plateau phase , it is due to the inward flux of the ca +ion and the outward efflux of the k+ ions . they are conteracting and the action potential remain un changed.

Phase 2 is represented by the S-t segment in the ECG

phase 3 - is the late repolarization phase , it is due to the outflux of the potassium ion through the inward rectifying k+ channel.

Phase 3 is represented by the T wave in the ECG

Sydney Mullin answered 1 year ago
Next > < Previous

Related Solutions

1. Describe how sound waves with volume and pitch turn to action potential and “hearing”. How...
1. Describe how sound waves with volume and pitch turn to action potential and “hearing”. How is the ear drum used to amplify sound? How is fluid used to stimulate the hair cells of the inner ear and, hence, create an action potential? 2.Describe how light waves of intensity and color turn to action potential and “sight”. Which cells are sensitive to brightness and color, which to peripheral vision and dim movements? How does light actually make and action potential...
PARAGRAPH ANALOGY OF ACTION POTENTIAL In a single paragraph discuss the process of an action potential....
PARAGRAPH ANALOGY OF ACTION POTENTIAL In a single paragraph discuss the process of an action potential. Explain it in a way that you would tell an eight year old - using an analogy. I would like to see you use an analogy and the more creative the better! Note: You CANNOT use the domino effect or firing a gun as the analogy. You must include four (4) of the following terms in your analogy: all-or-nothing response, axon, resting state, soma...
Compare and contrast a grade potential with an action potential?
Compare and contrast a grade potential with an action potential?
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?
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.
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.
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?
Predict how BOTH the ability to generate an action potential AND the shape of the action...
Predict how BOTH the ability to generate an action potential AND the shape of the action potential might change under the following conditions. Explain your answers. -Decrease in extracellular K+ concentration -Increase in number of Na+ leak channels -Blocking of Na+/K+ATPase with ouabain -Decrease in extracellular Na+ concentration
At the peak of an action potential, the membrane potential of a human motor neuron reaches...
At the peak of an action potential, the membrane potential of a human motor neuron reaches about +30mV. What value for “alpha”, the ratio of PNa/PK, allows this to occur. Use an online calculator/simulation to find a value for alpha that approximates what happens to reach this membrane potential, and write out the entire GHK equation (the version with just sodium and potassium) that can produce this membrane potential, including normal ion concentrations and temperature.
Define an action potential. How are the Na+, K+, and Ca+ ions involved in an action...
Define an action potential. How are the Na+, K+, and Ca+ ions involved in an action potential? How does the myelin speed up its transmission? Define a neurotransmitter. Where are they stored and how do they relay an action potential message from one cell to the next? Define threshold. How do neurotransmitters bring target cells toward or away from threshold. What happens to the response of the target cell if threshold is not reached? What happens if threshold is reached?...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT