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The heart is a muscular organ found in most animals.This organ pumps blood through the blood vessels of the circulatory system. The pumped blood carries oxygen and nutrients to the body, 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, other mammals, and birds, the heart is divided into four chambers ...
Jul 5, 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 to the chambers in the mammalian heart. In animals with lungs—amphibians, reptiles, birds, and mammals—the heart shows various stages of evolution ...
Pulmonary circulation is a portion of circulation responsible for carrying deoxygenated blood away from the heart, to the lungs and then bringing oxygenated blood back to the heart.; Systemic circulation is another portion of circulation where the oxygenated blood is pumped from the heart to every organ and tissue in the body, and deoxygenated blood comes back again to the heart.; Now, the heart itself is a muscle and therefore, it needs a constant supply of oxygenated blood. This is where ...
Jan 26, 2024 · What is the heart? The heart is a fist-sized organ that pumps blood throughout your body. It’s your circulatory system’s main organ. Muscle and tissue make up this powerhouse organ. Your heart contains four muscular sections that briefly hold blood before moving it.Electrical impulses make your heart beat, moving blood through these chambers.
Oct 4, 2019 · Heart Definition. 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.
Sep 30, 2020 · The heart beats around 100,000 times a day, pumping approximately 8 pints of blood throughout the body 24/7.This delivers oxygen- and nutrient-rich blood to tissues and organs and carries away waste.
Jul 27, 2022 · The human heart is located in the center of the chest - slightly to the left of the sternum (breastbone). It sits between your lungs and is encased in a double-walled sac called the pericardium ...
Mar 24, 2022 · 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 protects it.
Jun 11, 2024 · Atrial Septal Defect (ASD): This is a congenital (present at birth) heart defect where there is an abnormal opening in the septum (wall) between the atria (upper chambers) of the heart. ASDs can vary in size and may lead to abnormal blood flow between the atria, which can cause permanent damage to the lung blood vessels.
Mar 24, 2022 · The heart is an organ about the size of your fist that pumps blood through your body. It is made up of multiple layers of tissue. Your heart is at the center of your circulatory system.
