YOUKILLEDKENN :
Let’s start a discussion about the human body. Drop some cool facts about our organs below! I’ll start with the heart: The heart is a muscular organ found in humans and other animals. This organ pumps blood through the blood vessels.[1] The heart and blood vessels together make up 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 between the lungs, in the middle compartment of the chest, called the mediastinum.[4] the mediastinum isn’t the heart, but it houses the heart so I’ll include it here too. The mediastinum (from Medieval Latin: mediastinus, lit. 'midway';[2]pl.: mediastina) is the central compartment of the thoracic cavity. Surrounded by loose connective tissue, it is a region that contains vital organs and structures within the thorax, mainly the heart and its vessels, the esophagus, the trachea, the vagus, phrenic and cardiac nerves, the thoracic duct, the thymus and the lymph nodes of the central chest. The largest part of the heart is usually slightly offset to the left side of the chest (levocardia). In a rare congenital disorder (dextrocardia) the heart is offset to the right side and is felt to be on the left because the left heart is stronger and larger, since it pumps to all body parts. Because the heart is between the lungs, the left lung is smaller than the right lung and has a cardiac notch in its border to accommodate the heart.[8] The heart is cone-shaped, with its base positioned upwards and tapering down to the apex.[8] An adult heart has a mass of 250–350 grams (9–12 oz).[16] The heart is often described as the size of a fist: 12 cm (5 in) in length, 8 cm (3.5 in) wide, and 6 cm (2.5 in) in thickness,[8] although this description is disputed, as the heart is likely to be slightly larger.[17] Well-trained athletes can have much larger hearts due to the effects of exercise on the heart muscle, similar to the response of skeletal muscle.[8] A heart valve is a biological one-way valve that allows blood to flow in one direction thru the chambers of the heart
2026-05-12 03:01:30