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  1. www.thoughtco.com › the-heart-wall-4022792The 3 Layers of the Heart Wall - ThoughtCo

    Jul 26, 2024 · The heart is located in the chest cavity just posterior to the breastbone, between the lungs, and superior to the diaphragm. It is surrounded by a fluid-filled sac called the pericardium, which serves to protect this vital organ. The Layers of the Heart Wall . The heart wall is composed of connective tissue, endothelium, and cardiac muscle.

    • Myocardium

      Falty14 /Wikimedia Commons/CC by SA 4.0. Myocardium is the...

    • EPI

      Examples . Epiblast (epi-blast): the outermost layer of an...

    • Coronary Blood Vessels

      Arteries are vessels that carry blood away from the...

    • Pericardium

      Heart Exterior . The surface layer of the heart (epicardium)...

  2. www.ncbi.nlm.nih.gov › books › NBK279249In brief: How does the heart work? - InformedHealth.org ...

    Jun 6, 2023 · Blood vessels of the heart. The heart is a hollow muscle. A wall through the middle (known as the septum) divides it into two halves. Each half has two chambers called the atrium and ventricle. The left ventricle pumps oxygen-rich blood out of the heart and into the body (systemic circulation) through an artery called the aorta. The first blood ...

    • 2023/06/06

  3. biologydictionary.net › cardiac-muscleCardiac Muscle - Definition, Function and Structure | Biology ...

    • Cardiac Muscle Definition
    • Cardiac Muscle Structure
    • Function of Cardiac Muscle
    • Quiz

    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. Cardiac muscle is made from sheets of cardiac muscle cells. These cells, unlike skel...

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    Cardiac muscle exists only within the heart of animals. It is a specialized form of muscle evolved to continuously and repeatedly contract, providing circulation of blood throughout the body. The heart is a relatively simple organ. Through all the twists and turns and various chambers, there are only three layers. The outer layer, known as the epic...

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    As in skeletal muscle, the signal to contract is an action potential. However with skeletal muscle this signal usually comes from the somatic, or voluntary, nervous system. Cardiac muscle is controlled by the autonomous nervous system. Cells in your brain and cells embedded throughout your heart act to release well-timed nervous impulses which sign...

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    1. Which of the following answers lists components unique to skeletal muscle and cardiac muscle? A. Striated, Intercalated discs, branched B. Striated, Sarcomeres C.Actin and Myosin 2. An AED (Automated External Defibrillator) is a device used to restart a stopped heart. The AED pulses a strong jolt of electricity over the heart. Why does this rest...

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  4. www.kenhub.com › anatomy › layers-of-the-heartLayers of the heart: Epicardium, myocardium, endocardium - Kenhub

    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. Cardiomyocytes have a single nucleus in the center of the cell, which helps to distinguish them from skeletal ...

  5. med.libretexts.org › Bookshelves › Anatomy_and17.1C: Layers of the Heart Walls - Medicine LibreTexts

    The middle layer of the heart wall is the myocardium—the muscle tissue of the heart and the thickest layer of the heart wall. It is composed of cardiac muscle cells, or cardiomyocytes. Cardiomyocytes are specialized muscle cells that contract like other muscle cells, but differ in shape. Compared to skeletal muscle cells, cardiac muscle cells ...

  6. en.wikipedia.org › wiki › Cardiac_muscleCardiac muscle - Wikipedia

    Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissues, the others being skeletal muscle and smooth muscle. It is an involuntary, striated muscle that constitutes the main tissue of the wall of the heart .

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  8. www.ncbi.nlm.nih.gov › books › NBK535355Anatomy, Thorax, Cardiac Muscle - StatPearls - NCBI Bookshelf

    Aug 8, 2023 · Cardiac muscle (or myocardium) makes up the thick middle layer of the heart. It is one of three types of muscle in the body, along with skeletal and smooth muscle. The myocardium is surrounded by a thin outer layer called the epicardium (AKA visceral pericardium) and an inner endocardium. Coronary arteries supply to the cardiac muscle, and cardiac veins drain this blood. Cardiomyocytes are the ...