The Human Heart: A General Description

Improved Essays
The Human Heart: A General Description The heart is the main organ of the cardiovascular system in the human body. Its primary function is to pump oxygen- and nutrient-rich blood throughout the 60,000 miles of blood vessels that make up this system ("Heart, 2015"). About the size of a clenched fist, the heart is located in the middle of the chest, between the lungs and nestled behind the ribcage. It lies a little to the left of the sternum. The shape of the heart is reminiscent of an upside down pear with arteries and veins branching from its upper and lower regions. On the inside, the heart is separated into four chambers. The upper two chambers are the right and left atria and the lower two chambers are the right and left ventricles. …show more content…
The heart cavities and blood vessels are lined with epithelial tissue. The heart is enclosed inside of a double-walled epithelial sac called the pericardium. The pericardium helps to protect the heart, keep it anchored, and protect the heart from over-filling with blood ("Heart Anatomy: size, location, coverings and layers, 2013"). The heart is the only organ in the body composed of the muscular tissue called the cardiac muscle. The three layers of the heart, the epicardium, myocardium, and endocardium, are made of the cardiac muscle tissue ("Heart Anatomy: size, location, coverings and layers, 2013"). The nervous tissue is embedded in the connective tissues that are in the heart as well. The nervous tissue is there to help the heart continuously beat and the connective tissue anchors those nerves …show more content…
Without the epithelial cells, the heart would not have structure, as the pericardium is made of simple squamous epithelial cells. The linings of the different chambers of the heart are also made of epithelial cells and help keep the blood contained. The nerve cells are what keep the heart pumping and circulating the blood through the body, allowing wastes to be excreted and nutrients to be absorbed. Cardiac muscle cells are an important cell in the heart that contract the different areas of the heart (Starr, 2006). This muscle is formed to withstand the constant activity that takes place in the cardiovascular system (Taylor, n.d.). Each type of cell has its own job and is vital to the function of the heart. If any of the cells are impaired in some way, homeostasis in the heart and cardiovascular system will be

Related Documents

  • Improved Essays

    The pericardium is the membranes enclosing the heart, consisting of an outer fibrous layer and an inner double layer of serious membranes. The Myocardium is the middle muscular wall of the heart. It pumps blood out of the heart and then relaxes as the heart refills with returning blood. The myocardium plays the most important role. Also, it causes the rhythm of the heart.…

    • 708 Words
    • 3 Pages
    Improved Essays
  • Superior Essays

    The Circulatory System

    • 1032 Words
    • 4 Pages

    This circuit carries blood to all the nooks and crannies of the body excluding the lungs. In the systemic circuit, the newly oxygenated blood, from the pulmonary circuit, leaves the body through the left ventricle to the aorta, and enters the arteries and capillaries where it supplies the body 's tissues with oxygen. The now oxygen-depleted blood returns back to the heart, completing the circuit. The pulmonary and systemic circulations are on a continuous loop, pumping blood to and from the heart. The heart is critical to the body for survival because it pumps the blood and nutrients that the…

    • 1032 Words
    • 4 Pages
    Superior Essays
  • Improved Essays

    Circulatory System Essay

    • 1290 Words
    • 6 Pages

    (“Arteries, Veins, and Capillaries”) Blood goes through the body in blood vessels called arteries, capillaries and veins. Arteries keep blood flowing away from the heart and throughout the body. The blood that travels through the arteries carries o2 molecules to give to the whole body. Arteries are thicker than any blood vessel in the body because it helps with the high pressures of blood being pumped from the heart. Once the blood traveling through the arteries reach the end of that particular blood vessel, it goes through a smaller blood vessel called the capillaries.…

    • 1290 Words
    • 6 Pages
    Improved Essays
  • Improved Essays

    Everyday our bodies need oxygen and different nutrients to function properly but in order to maintain that constancy, our blood has to be constantly moving. And in order for our cells to get transported and get everything they need, the heart needs to be beating. The cardiovascular system makes sure the levels of substances in the blood is constant by transporting these substances as circumstances change. The heart is located in the lower part of the mediastinum between the lungs. Most people think the heart lies on the left side of the body but if the chest was cut in half, two thirds of the heart would be on the left and one third would actually be on the right side of the body.…

    • 1098 Words
    • 4 Pages
    Improved Essays
  • Improved Essays

    The heart has connective tissue in the form of fibrillary collagen that offers support (Burlew & Weber, 2000). The heart has cardiac muscle, which has intercalated discs to give the signal to contract and start the heartbeat (Ireland, 2012). Smooth muscle is also present in the arteries and vasculature (Xin, Olson, & Bassel-Duby, 2013). The heart also has parasympathetic and sympathetic nervous tissue in the form of fibers (Olshansky, Sabbah, Hauptman, & Colucci, 2008). All these tissue types serve their own functions, yet work together for the overall health of the organ.…

    • 823 Words
    • 4 Pages
    Improved Essays
  • Decent Essays

    (1) 2 Pericardium – the membrane that surrounds and protects the heart. It consists of outer fibrous layer and inner pericardium. 3 Right atrium – receives blood from three veins such as the superior vena cava, inferior vena cava, and coronary sinus. 4 Right ventricles – form most of the anterior surface of the heart. 5.…

    • 1414 Words
    • 6 Pages
    Decent Essays
  • Superior Essays

    Explain the significance of the thickness of the left ventricular wall. The left ventricle works harder as it pumps blood to the systemic circuit, not just to the pulmonary portions as the right ventricular does. Therefore, the left ventricular walls are thicker, to support the hard work that it has to do throughout the body (Martini & Nath,2014 p.685) The major coronary vessels are on the surface of the heart. What is the advantage of that location? The heart has its own blood supply from the Coronary arteries.…

    • 947 Words
    • 4 Pages
    Superior Essays
  • Improved Essays

    The left side of the heart receives oxygenated blood from the lungs and pumps it to the cells and tissues to the body. The blood then returns to the right side of the body this is called systemic circuit. From the heart blood flows through large muscular arteries, then into smaller and smaller arteries, then arterioles and finally to the capillaries. It’s in the capillaries where the diffusion process takes place to exchange molecules of oxygen and nutrients for carbon dioxide of nearby cells, after leaving the capillaries blood is collected into venules the smallest of veins then into veins of increasing size until it reaches the heart [6]. The right side of the heart receives blood returning from the tissues and pumps it towards the lungs,…

    • 569 Words
    • 3 Pages
    Improved Essays
  • Improved Essays

    Dissection Summary

    • 713 Words
    • 3 Pages

    The heart is located between the two lungs in the middle of the chest; it will be behind and slightly to the left of the sternum. ANATOMY BOOK The heart consists of various tissue types (Revision World, 2015). The most important muscle the heart has in it is called the cardiac muscle (Revision World, 2015). Each cell that contributes to the heart is called myogenic; this means that it has its own inherent rhythm (Revision World, 2015). The heart consists of four different chambers.…

    • 713 Words
    • 3 Pages
    Improved Essays
  • Improved Essays

    Function of heart and lungs The heart and the lungs are the most important part of the human body. The human body is able to function properly with the help of heart and lungs. The lungs help the human body in the respiration process and gas exchange, whereas the heart has the job to pump blood into the body. The heart uses the help of blood vessels to deliver blood into the body. The blood vessel, vein, has the duty to deliver deoxygenated blood to the heart.…

    • 1157 Words
    • 5 Pages
    Improved Essays

Related Topics