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  1. Oct 31, 2024 · heart, organ that serves as a pump to circulate the blood. It may be a straight tube, as in spiders and annelid worms, or a somewhat more elaborate structure with one or more receiving chambers (atria) and a main pumping chamber (ventricle), as in mollusks. In fishes the heart is a folded tube, with three or four enlarged areas that correspond ...

    • Kids

      It is located high in the chest, slightly to the left. The...

    • Coronary Heart Disease

      coronary heart disease, disease characterized by an...

    • Heart Rate

      heart rate, the number of times the ventricles of the heart...

    • Pulmonary Circulation

      pulmonary circulation, system of blood vessels that forms a...

    • Heart Murmur

      If a physician hears a heart murmur through a stethoscope,...

    • Students

      Encyclopædia Britannica, Inc. A muscular, pear-shaped organ...

    • Ventricle

      Ventricle, muscular chamber that pumps blood out of the...

    • Chambered Heart

      Other articles where chambered heart is discussed:...

  2. Nov 10, 2024 · The heart is a four-chambered muscular organ with a complex structure that allows it to efficiently pump blood throughout the body. It is divided into two halves—the right and left sides—each responsible for different aspects of circulation.

    • Heart Definition
    • Function of The Heart
    • Heart Structure
    • Quiz
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    The heart is a muscular organ that pumps blood throughout the body. It is located in the middle cavity of the chest, between the lungs. In most people, the heart is located on the left side of the chest, beneath the breastbone. The heart is composed of smooth muscle. It has four chambers which contract in a specific order, allowing the human heart ...

    The heart pumps blood through our immense and complicated circulatory systems at high pressure. It is a truly impressive feat of engineering, as it must circulate about five liters of blood through a full 1,000 miles worth of blood vessels each minute! We will talk more about how the heart accomplishes this remarkable task under the “Heart Structur...

    The heart’s unique design allows it to accomplish the incredible task of circulating blood through the human body. Here we will review its essential components, and how and why blood passes through them.

    1. Which of the following is NOT true of the human heart? A. It has four chambers. B. It has a built-in “pacemaker” called the sinoatrial node. C. It is responsible for pumping oxygen-filled blood around the body. D.It is the only organ in the body you cannot live without. 2. Which of the following is NOT a layer of the heart? A. The myocardium B. ...

    Learn about the heart's layers, chambers, valves, and blood vessels, and how they work together to pump blood through the body. The heart is a muscular organ with four chambers that contract in a specific order, allowing the human heart to pump blood from the body to the lungs and back again with high efficiency.

  3. Jan 26, 2024 · Your heart pumps blood through three types of blood vessels: Arteries carry oxygen-rich blood from your heart to your body’s tissues. The exception is your pulmonary arteries, which go to your lungs. Veins carry oxygen-poor blood back to your heart. Capillaries are small blood vessels where your body exchanges oxygen-rich and oxygen-poor blood.

  4. The external structure of the heart has many blood vessels that form a network, with other major vessels emerging from within the structure. The blood vessels typically comprise the following: Veins supply deoxygenated blood to the heart via inferior and superior vena cava, and it eventually drains into the right atrium.

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  5. The structure of the heart If you clench your hand into a fist, this is approximately the same size as your heart. It is located in the middle of the chest and slightly towards the left.

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  7. Nov 3, 2023 · The aortic semilunar valve is between the left ventricle and the opening of the aorta. It has three semilunar cusps/leaflets: left/left coronary, right/right coronary, and posterior/non-coronary. In clinical practice, the heart valves can be auscultated, usually by using a stethoscope.

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