Medicine, 12.08.2020 05:01 mcfancei

Which is the correct path of an electrical excitation from the pacemaker to a cardiomyocyte in the left ventricle (LV)?

Answers: 3

Show answers

Answers

Answer from: khaekhae10

The question is lacking the options, below is the completely stated question and options:

This is the correct path of an electrical excitation from the pacemaker to a cardiocyte in the left ventricle (LV).

A. sinoatrial (SA) node → atrioventricular (AV) node → atrioventricular (AV) bundle → Purkinje fibers → cardiocyte in LV

B. atrioventricular (AV) node → sinoatrial (SA) node → atrioventricular (AV) bundle → Purkinje fibers → cardiocyte in LV

C. sinoatrial (SA) node → atrioventricular (AV) bundle → atrioventricular (AV) node → Purkinje fibers → cardiocyte in LV

D. atrioventricular (AV) node → Purkinje fibers → atrioventricular (AV) bundle → sinoatrial (SA) node → cardiocyte in LV

E. sinoatrial (SA) node → atrioventricular (AV) node → Purkinje fibers → atrioventricular (AV) bundle → cardiocyte in LV

The correct answer is:

sinoatrial (SA) node → atrioventricular (AV) node → atrioventricular (AV) bundle → Purkinje fibers → cardiocyte in LV (A.)

Explanation:

The electrical impulse conduction system of the heart refers to the pathways through which electrical signals pass, to cause excitation of specific paths of the heart, leading to depolarization, which in turn leads to contraction and relaxation of the heart. The correct excitation pathway is as follows:

1. Normal excitation originates in the sinoatrial (SA) node, from which depolarization spreads throughout the atria, causing impulses (excitation) to spread from the SA node to the atria. It is believed that this depolarization spreads to the atrial cells through adjacent myocardial cells and myofibrils.

2. Next, the depolarization from the atria reaches the atrioventricular (AV) node, causing excitation of the AV node. The AV node is located on the floor of the right ventricle, close to the interventricular septum. The excitation leaves this site by two pathways; the fast and slow pathways which vary based on the time of transmission of impulses to the next phase.

3. Next, from the AV node, the excitation is passed to the two branches of the bundle of His, which form a network of fibers known as purkinje fibers, from where excitation passes to the apical region of the left and right ventricles causing depolarization of the ventricular myocardium.

Attached to this answer is a picture to show what the pathway looks like.

Answer from: Quest

Ithink the answer is true.

Answer from: Quest

Ithink the answer is false

Another question on Medicine

Medicine, 06.07.2019 22:10

The first step in culturally sensitive counseling is to obtain the education and guidance necessary to understand that culture and to process any feelings that could interfere with counselor empathy: true or false

Answers: 3

Answer

Medicine, 09.07.2019 19:10

Anurse is preparing to administer lidocaine via continuous iv infusion at 4 mg/min. available is lidocaine 2 g dextrose 5% in water 500 ml. the nurse should set the iv pump to deliver how many ml/hr? (round the answer to the nearest whole number. use a leading zero if applicable. do not use a trailing zero.)

Answers: 3

Answer

Medicine, 09.07.2019 19:20

Anurse is assessing a client who is receiving clindamycin. which of the following findings should the nurse identify as an adverse effect of this medication? a. report of blurred vision b. watery diarrhea c. hypertension d. agitation

Answers: 3

Answer

Medicine, 09.07.2019 20:20

Which of the following is an example of airborne transmission? a. sneezing by an infected person not covering his mouth b. acquiring a disease from an insect bite c. fomites, such as hospital bedding and linen d. inanimate objects, such as medical equipment and supplies

Answers: 2

Answer

You know the right answer?

Which is the correct path of an electrical excitation from the pacemaker to a cardiomyocyte in the l...

Questions