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  1. More Images

    Heart

    Inner organ for the circulation of blood

    The heart is a muscular organ found in humans and other animals. This organ pumps blood through the blood vessels. Heart and blood vessels together make the circulatory system. The pumped blood carries oxygen and nutrients to the tissue, while carrying metabolic waste such as carbon dioxide to the lungs. In humans, the heart is approximately the size of a closed fist and is located between the lungs, in the middle compartment of the chest, called the mediastinum. In humans, the heart is divided into four chambers: upper left and right atria and lower left and right ventricles. Commonly, the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart. In a healthy heart, blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. Wikipedia

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  2. en.wikipedia.org

    The heart is a muscular organ found in humans and other animals.This organ pumps blood through the blood vessels. [1] Heart and blood vessels together make the circulatory system. [2] The pumped blood carries oxygen and nutrients to the tissue, while carrying metabolic waste such as carbon dioxide to the lungs. [3] In humans, the heart is approximately the size of a closed fist and is located ...
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  4. britannica.com

    Dec 9, 2024heart, 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 to the chambers in the mammalian heart.
    Author:The Editors of Encyclopaedia Britannica
  5. nhlbi.nih.gov

    The heart is made of three layers of tissue. Endocardium is the thin inner lining of the heart chambers and also forms the surface of the valves.; Myocardium is the thick middle layer of muscle that allows your heart chambers to contract and relax to pump blood to your body.; Pericardium is the sac that surrounds your heart. Made of thin layers of tissue, it holds the heart in place and ...
  6. medicinenet.com

    Jan 8, 2025The heart is an amazing organ. It starts beating about 22 days after conception and continuously pumps oxygenated red blood cells, nutrient-rich blood, and other compounds like platelets throughout your body to sustain the life of your organs.Its pumping power also pushes blood through organs like the lungs to remove waste products like CO2.. This fist-sized powerhouse beats (expands and ...
  7. Nov 3, 2023Heart valves in a cadaver Semilunar valves prevent backflow from the great vessels to the ventricles.. The pulmonary semilunar valve is between the right ventricle and the opening of the pulmonary trunk.It has three semilunar cusps/leaflets: anterior/non-adjacent, left/left adjacent, and right/right adjacent.

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