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Jan 17, 2023 · Key Terms. Purkinje fibers: A bundle of nerve fibers located under the endocardium, which supply nervous impulses to the mycardium’s cardiac muscle tissues. endocardium: A thin serous membrane that lines the interior of the heart and valves. cardiomyocyte: A cardiac muscle cell (or myocyte) in the heart, which makes up the cardiac muscle ...
Aug 17, 2023 · The parts of the heart conduction system can be divided into those that generate action potentials (nodal tissue) and those that conduct them (conducting fibers). Although all parts have the ability to generate action potentials and thus heart contractions, the sinuatrial (SA) node is the primary impulse initiator and regulator in a healthy heart .
May 18, 2021 · Describe the location and position of the heart within the body cavity. Describe the internal and external anatomy of the heart. Identify the tissue layers of the heart and pericardium. Relate the structure of the heart to its function as a double pump. Compare atrial and ventricular systole and diastole.
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The cardiac conduction system is a group of specialized cardiac muscle cells in the walls of the heart that send signals to the heart muscle causing it to contract. The main components of the cardiac conduction system are the SA node, AV node, bundle of His, bundle branches, and Purkinje fibers.
- Regina Bailey
- Epicardium. Epicardium (epi-cardium) is the outer layer of the heart wall. It is also known as visceral pericardium as it forms the inner layer of the pericardium.
- Myocardium. Myocardium (myo-cardium) is the middle layer of the heart wall. It is composed of cardiac muscle fibers, which enable heart contractions. The myocardium is the thickest layer of the heart wall, with its thickness varying in different parts of the heart.
- Endocardium. Endocardium (endo-cardium) is the thin inner layer of the heart wall. This layer lines the inner heart chambers, covers heart valves, and is continuous with the endothelium of large blood vessels.
Jun 21, 2019 · How is it structured? Cardiac muscle tissue gets its strength and flexibility from its interconnected cardiac muscle cells, or fibers. Most cardiac muscle cells contain one nucleus, but some...
Nov 3, 2023 · The myocardium is functionally the main constituent of the heart and the thickest layer of all three heart layers. It is a muscle layer that enables heart contractions. Histologically, the myocardium is comprised of cardiomyocytes .
