hjartavöðvinn

Hjartavöðvinn is the Icelandic term for the heart muscle, also known as the myocardium. It is a specialized type of muscle tissue found only in the heart of vertebrates. The primary function of hjartavöðvinn is to pump blood throughout the body. This muscle is involuntary, meaning its contractions are not under conscious control.

The structure of hjartavöðvinn is unique, composed of branched cardiac muscle cells called cardiomyocytes. These cells are interconnected by specialized junctions called intercalated discs, which allow for rapid electrical communication between cells. This ensures that the heart muscle contracts in a coordinated and rhythmic manner, essential for efficient blood circulation.

Hjartavöðvinn is highly resistant to fatigue due to its abundant mitochondria, which provide ample energy for continuous contractions. The muscle receives its oxygen and nutrients through the coronary arteries. Damage to the hjartavöðvinn, such as during a myocardial infarction (heart attack), can impair the heart's ability to pump blood effectively and can have serious health consequences. Maintaining the health of hjartavöðvinn is crucial for overall cardiovascular well-being.