All categories

2 years ago

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

Medicine

1 answer:

lys-0071 [83]2 years ago

5 0

Answer:

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

Answer:

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.

You might be interested in

Painful or difficult menstruation is known as

Pachacha [2.7K]

Answer: Dysmenorrhea

Explanation:

Dysmenorrhea is the medical term it is like the difficult or painful menstuation or *period. There are two types of dysmenorrhea; primary and secondary. Primary dysmenorrhea is the most common kind of dysmenorrhea. :)

6 0

2 years ago

patient is concerned about pigmented skin lesions on her body, her pmd informed the patient that these lesions must be monitored

OleMash [197]

Those pores and skin spots and growths are due to melanocyte cells inside the pores and skin. Melanocytes are the cells that produce melanin, the substance that offers coloration (pigment) to the pores and skin cancers

A visual self-exam by using the affected person and a scientific examination by way of the health care company may be used to screen for pores and skin cancers. all through a pores and skin examination a health practitioner or nurse tests the skin for moles, birthmarks, or other pigmented areas that look bizarre in color, length, form, or texture.

Communicate with your health practitioner in case you observe modifications in your pores and skin which include a brand new growth, a sore that doesn't heal, an exchange in a vintage boom, or any of the A-B-C-D-Es of melanoma. A trade to your skin is the most not unusual signal of skin cancer. this will be a brand new increase, a sore that does not heal, or an alternate in a mole.

Learn more about skin cancers here:

brainly.com/question/25033946

#SPJ9

8 0

9 months ago

How do you delete a question here

Genrish500 [490]

Answer:

u can't

Explanation:

7 0

2 years ago

Read 2 more answers

How do vaccines work? Do they work against viruses and bacteria? Why there<br> are so many vaccines.

Liono4ka [1.6K]

Answer:

Vaccines train our immune systems to create proteins that fight disease, known as ‘antibodies’, just as would happen when we are exposed to a disease but – crucially – vaccines work without making us sick. Live, attenuated vaccines fight viruses and bacteria. These vaccines

contain a version of the living virus or bacteria that has been weakened

so that it does not cause serious disease in people with healthy immune

systems. Because live, attenuated vaccines are the closest thing to a

natural infection, they are good teachers for the immune system.

Examples of live, attenuated vaccines include measles, mumps, and

rubella vaccine (MMR) and varicella (chickenpox) vaccine. Even

though they are very effective, not everyone can receive these vaccines.

Children with weakened immune systems—for example, those who are

undergoing chemotherapy—cannot get live vaccines. Those are only some vaccines, of course not all vaccines inject a live virus into your body. And of course, there are so many vaccines because (unfortunately) there are so many diseases!

3 0

2 years ago

How to find the equation of a line with one point and no slope

adelina 88 [10]

Answer: the "y=mx+b" form (called the slope-intercept form of the equation of a line).

Explanation: Finding the equation for a line is a common problem in geometry and trigonometry. There are two common situations where you are asked to find the equation for a line: either you'll be provided with one point on the line and the slope of the line, or you'll be provided two points on the line.

The "b" value (called the y-intercept) is where the line crosses the y-axis.

So point (x1, y1) is actually at (0, b)

and the equation becomes:

Start with

y − y1 = m(x − x1)

(x1, y1) is actually (0, b):

y − b = m(x − 0)

Which is:

y − b = mx

Put b on other side:

y = mx + b

7 0

2 years ago