Cardiac muscle

Definition

Cardiac muscle is a specialized type of muscle tissue found only in the heart. It is responsible for the rhythmic contractions that pump blood throughout the body.

5 Must Know Facts For Your Next Test

1. Cardiac muscle cells are connected by intercalated discs, which facilitate synchronized contractions.
2. The energy demands of cardiac muscle are high, requiring a constant supply of oxygen and nutrients.
3. Cardiac muscle operates involuntarily, meaning it functions without conscious control.
4. Proper nutrition, including adequate intake of omega-3 fatty acids, magnesium, and potassium, can support cardiac muscle function.
5. Deficiencies in essential nutrients like vitamin D can negatively impact cardiac muscle health and contribute to cardiovascular diseases.

Review Questions

• What structural feature allows cardiac muscle cells to contract in unison?
• Why do cardiac muscles have high energy demands?
• How does proper nutrition influence cardiac muscle function?

Related terms

Myocardium: The thick middle layer of the heart wall composed primarily of cardiac muscle cells.

Intercalated Discs: Specialized connections between cardiac muscle cells that enable coordinated contractions.

Involuntary Muscle: Muscle that operates without conscious control; includes cardiac and smooth muscles.