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- Cardiac muscle differs from skeletal muscle in that it exhibits rhythmic contractions and is not under voluntary control. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart’s pacemaker. The heart consists mostly of cardiac muscle cells (or myocardium).
www.britannica.com/science/cardiac-muscleCardiac muscle | Definition, Function, & Structure | Britannica
Oct 4, 2019 · Cardiac muscle, also known as heart muscle, is the layer of muscle tissue which lies between the endocardium and epicardium. These inner and outer layers of the heart, respectively, surround the cardiac muscle tissue and separate it from the blood and other organs.
Jul 30, 2023 · The primary function of cardiac muscle is to pump blood into circulation by generating sufficient force. The mechanism behind each coordinated contraction involves the cardiac muscle and electrical impulses.
- 2023/07/30
Oct 19, 2024 · Cardiac muscle differs from skeletal muscle in that it exhibits rhythmic contractions and is not under voluntary control. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart’s pacemaker.
- The Editors of Encyclopaedia Britannica
Key Terms. excitation contraction coupling (ECC): The physiological process of converting an electrical stimulus to a mechanical response. calcium-induced calcium release (CICR): A process whereby calcium can trigger release of further calcium from the muscle sarcoplasmic reticulum.
May 3, 2007 · This article provides an overview of cardiac muscle physiology. We describe the structure of the cardiac myocyte, the generation and spread of the cardiac action potential, the process of excitation-contraction coupling, and the metabolism and energetics of the heart.
- Jeremy Pinnell, Simon Turner, Simon Howell
- 2007
Jul 27, 2022 · Describe the structure of cardiac muscle. Identify and describe the components of the conducting system that distributes electrical impulses through the heart. Compare the effect of ion movement on membrane potential of cardiac conductive and contractile cells.
Calcium ions play two critical roles in the physiology of cardiac muscle. Their influx through slow calcium channels accounts for the prolonged plateau phase and absolute refractory period that enable cardiac muscle to function properly.
