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  2. Pericardium - Wikipedia

    en.wikipedia.org/wiki/Pericardium

    The pericardium (pl.: pericardia), also called pericardial sac, is a double-walled sac containing the heart and the roots of the great vessels. [1] It has two layers, an outer layer made of strong inelastic connective tissue (fibrous pericardium), and an inner layer made of serous membrane (serous pericardium).

  3. Heart - Wikipedia

    en.wikipedia.org/wiki/Heart

    The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium. [8] The heart pumps blood with a rhythm determined by a group of pacemaker cells in the sinoatrial node. These generate an electric current that causes the heart to contract, traveling through the atrioventricular node and along the conduction system of ...

  4. Anatomy of the human heart - Wikipedia

    en.wikipedia.org/wiki/Anatomy_of_the_human_heart

    The heart is a muscular organ situated in the mediastinum.It consists of four chambers, four valves, two main arteries (the coronary arteries), and the conduction system. The left and right sides of the heart have different functions: the right side receives de-oxygenated blood through the superior and inferior venae cavae and pumps blood to the lungs through the pulmonary artery, and the left ...

  5. Serous membrane - Wikipedia

    en.wikipedia.org/wiki/Serous_membrane

    A serous membrane lines the pericardial cavity of the heart, and reflects back to cover the heart, much like an under-inflated balloon would form two layers surrounding a fist. Called the pericardium, this serous membrane is a two-layered sac that surrounds the entire heart except where blood vessels emerge on the heart's superior side; [4]

  6. Mesothelium - Wikipedia

    en.wikipedia.org/wiki/Mesothelium

    The mesothelium is a membrane composed of simple squamous epithelial cells of mesodermal origin, [2] which forms the lining of several body cavities: the pleura (pleural cavity around the lungs), peritoneum (abdominopelvic cavity including the mesentery, omenta, falciform ligament and the perimetrium) and pericardium (around the heart).

  7. Purkinje fibers - Wikipedia

    en.wikipedia.org/wiki/Purkinje_fibers

    The Purkinje fibers are specialized conducting fibers composed of electrically excitable cells. [3] They are larger than cardiomyocytes with fewer myofibrils and many mitochondria . They conduct cardiac action potentials more quickly and efficiently than any of the other cells in the heart's electrical conduction system . [ 4 ]

  8. The 2025 Men’s Health Fitness Awards: The Best New ... - AOL

    www.aol.com/lifestyle/2025-men-health-fitness...

    GoRuck’s flagship Rucker 4.0 is made for exactly that, with reinforced construction, extra padded straps, and plenty of handles. But what we really love is the pack’s versatility.

  9. Endocardium - Wikipedia

    en.wikipedia.org/wiki/Endocardium

    Illustration depicting the layers of the heart wall including the innermost endocardium. The endocardium (pl.: endocardia) is the innermost layer of tissue that lines the chambers of the heart. Its cells are embryologically and biologically similar to the endothelial cells that line blood vessels. The endocardium also provides protection to the ...

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