Circulatory System
Circulatory system, cardiac location and structures, the heart is the driving force of the circulatory system, contracting about 70 times/minute to pump an adequate volume of blood with sufficient pressure to perfuse all body organs. The muscular organ weights from 300 to 400g, it's located within the mediastinum of the thoratic cavity. Living things must be capable of transporting nutrients, wastes and gases to and from cells. Single-celled organisms use their cell surface as a point of exchange with outside environment. Multicellular organisms have developed transport and circulatory systems to deliver oxygen and food to cells and remove carbon dioxide and metabolic wastes. Sponges are the simplest animals, yet even they have a transport system. Seawater is the medium of transport and is propelled in and out of the songe by ciliary action. Simple animals, such as the hydra and planaria, lack specialized organs such as hearts and blood vessels, instead using their skin as exchange points for material. This, however, limits the size an animal can attain. To become larger, they need specialized organs and organs system. The heart has three tissue layers: the epicardium (outer layer), the myocardium (middle layer),and the endocardiu
Sweat glands, salivary glands, and digestive glands are examples of exocrine glands. These signals are passed through the blood to arrive at a target organ, which has cells possessing the appropriate receptor. The tight ventricle and prevents back flow to the right ventricle pumps blood through the pulmonary capillaries, and the alveolar capillaries, gas exchange occurs, that is, blood gives off carbon dioxide and receives oxygen. Solubility of the various hormone classes varies. Both the mitral and the tricuspid valves are attached to the strong chorae tendineae, fibrous filaments that arise from the papillary muscles of the ventricle. Blood flows in blood vessels as a liquid but it can turn solid when needed. the atria are thin walled, low-pressure chambers that serve primarily as reservoirs for blood flow into the ventricles. If you have this disease flu-like symptoms occur in most people with myocarditis. Because the left ventricle must achieve the high pressure needed for systemic circulation, it is much thicker than the right ventricle, the right atrium receives venous blood from the body via the venae cavae. The myocardium, thickest of the three tissue layers, is composed of muscle fibers that contract, creating the pumping effect of cardiac activity. The ventricles are formed by muscle fibers that contract to eject blood to the pulmonary vasculature (right) and systemic circulation (left). At the base of the right atrium is the tricuspid value, which controls blood flow into the right ventricle and prevents back flow to the atrium during ventricular systole. Aneurysms form where arteries get weak and the pressure of the blood is high, a bubble or a bulge form at these places. The walls get weak because of disease, injury, or one is born with it. Exocrine glands (not part of the endocrine system) secrete products that are passed outside the body.
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