Myokard

The video tutorial explains the structure and function of the heart, focusing on its four chambers and the layers of the heart wall: pericardium, epicardium, myocardium, and endocardium. It highlights the myocardium's role in heart contraction and relaxation, driven by electrical stimuli from pacemaker cells. The myocardium is crucial for pumping blood through the heart and circulation.

What are the four chambers of the heart?

• Left and right atria, left and right ventricles

• Left and right atria, left and right capillaries

• Left and right atria, left and right arteries

• Left and right ventricles, left and right veins

Which layer of the heart wall is the thickest?

• Myocardium

• Epicardium

• Endocardium

• Pericardium

What is the primary function of the myocardium?

• To store blood

• To pump blood through contraction and relaxation

• To protect the heart

• To regulate blood pressure

Where are the pacemaker cells located?

• In the pericardium

• In the epicardium

• In the endocardium

• In the myocardium

How does the electrical stimulus affect the heart?

• It causes the heart to shrink

• It causes the heart muscles to contract

• It causes the heart to expand

• It causes the heart to stop