Electrical Conduction System of the Heart Practice Problems

Which of the following structures helps to electrically insulate the ventricular cells from the atrial cells?

Which layer of the pericardium is tough and fibrous, providing protection and anchoring the heart in the chest?

Choose which statement is correct about the heart.

I. The heart contracts without any external stimulation due to autorhythmiticity.

II. The pacemaker cells of the heart do not contribute to the contractile force of the heart

Identify the correct order of the parts of the conduction system of heart.

Which of the following is not an intrinsic control of arteriolar smooth muscle in the systemic circulation?

All of the following state the similarities between the cardiac muscle and skeletal muscle fibers except:

What cardiac center controls the parasympathetic neurons that slow down the heart rate?

Where in the heart's conducting system does the atrial contraction finish, and the ventricular contraction commence?

Which of the following actions increases muscle contractility?

How do the papillary muscles contribute to the prevention of backflow of blood into the atria during ventricular systole?

What may cause heart valve cusps to close improperly and lead to AV valve regurgitation?

Cardiac muscle has a unique property known as autorhythmicity, which means:

What is the role of intrinsic factor, produced in the stomach, in the absorption of vitamin B12?

What are intercalated discs responsible for in the cardiac muscle cells?

Which of the following structures helps increase the contractile strength of the atria during atrial contraction?

Which of the following contains a dense network of collagen fibers that stabilize the position of the heart?

Which of the following layers of the heart consists of specialized cardiac muscle tissue that is responsible for the heart's contraction?

The areolar tissue is present in all the layers of the heart except:

What structure of the intercalated discs provides mechanical strength and prevents the separation of adjacent cardiomyocytes during the forceful contractions of the heart?

The Bundle of His, known as the atrioventricular (AV) bundle, is a collection of heart muscle cells specialized for electrical conduction. Where is the bundle of His located within the heart?

Which layer of the serous pericardium lines the interior of the fibrous pericardium?

The heart walls are composed of three layers. Which layer of the heart is also known as the visceral pericardium?

All of the following factors affect heart rate, except:

The hormone atrial natriuretic peptide is secreted in response to:

The part of the heart conduction system that leads the normal rhythm and rate of the heart:

The AV node is located in between the atria and the ventricles of the heart. Which of the following is the correct reason behind AV node delay:

a) It allows the atriums and ventricles to depolarize and contract together.

b) It allows the left and right ventricles to contract separately.

c) It allows the atria to be drained of blood before the ventricle contracts

d) None of the above

The Ivabradine can slow the depolarization of pacemaker cells resulting in: