Red blood cells move through the lungs, taking in oxygen and exchanging it for carbon dioxide.The heart pumps blood back to the lungs to eliminate carbon dioxide and absorb oxygen.Veins carry oxygen-poor blood back to the heart.Throughout the body, red blood cells deliver oxygen to cells and remove carbon dioxide.They travel through the arteries to the body. Oxygen-rich blood cells travel to the heart from the lungs.Blue arrows show the path of oxygen-poor blood. Red arrows show the path of oxygen-rich blood cells. The circulatory and respiratory systems work together to transport oxygen-rich blood through the body.Ī diagram shows a cross-section of a heart between two lungs. The content needs to be extracted from the image and included in the description. ![]() This is an example of an image in which text is embedded in the image and is not accessible. In most mainstream reading tools, the description will not be displayed at all, but in tools designed for accessibility (or mainstream tools with accessibility features enabled) the description could be displayed below the image, voiced as part of the content, or both. How the image description is displayed depends on the reading tool being used. Tactile images are used for images or diagrams where the physical relationships between elements of the image are important. Written image descriptions are widely used for images that illustrate a process or simple concept. The choice of modality varies depending on factors such as the information to be conveyed, grade level, student knowledge and experience, and the image itself. This image can be made accessible with an image description or by using a tactile graphic. Each day, your heart beats about 100,000 times and pumps about 23,000 litres (5,000 gallons) of blood through it.To zoom, click here. The system explained above is called the circulatory system and serves to pump the eight pints (or five litres) of blood contained in your body from head to toe, recirculating the blood constantly. The coronary arteries spread across the outside of the myocardium, feeding it with a supply of blood. This supply of blood comes from the coronary arteries as it leaves the left ventricle. Like every other living tissue, the myocardium itself needs a continuous supply of fresh blood. The walls of the heart are made of specialised muscle cells called myocardium. It pumps this to your lungs where, upon picking up a fresh supply of oxygen, it becomes bright red.Įach side of the heart has a thin-walled ‘collecting chamber’ (the atrium) which helps to fill the thick-walled main pump (the ventricle). The right side of the heart receives dark, de-oxygenated blood which has circulated around your body. The two sides of the heart are separate but they work together. When it contracts again this blood is forced to the lungs to retrieve oxygen and then continues to the left side of the heart. It starts off at the capillaries, joins to veins and then much larger veins and back to the right side of the heart (blue on the diagram).īetween each heart beat the heart relaxes and blood fills its right side. ![]() The blood travels back to the heart from all areas of the body having given the nutrients and oxygen required. The arteries divide off into smaller and smaller branches to supply a microscopic network of capillaries, taking the blood to every part of your body, even to the heart itself. With each heartbeat, the heart pumps blood forward from the left side of the heart through the aorta and into the arteries. The illustration below shows the heart, the arrows show the direction the blood flows in and the colour shows the oxygen levels of the blood, red is blood carrying oxygen and blue is blood with no or low oxygen. The left side of the heart receives oxygen-rich blood from the arteries in the lungs, and pumps it through the aorta to the body. There, it picks up fresh oxygen and releases carbon dioxide and then passes through to the left side of the heart. The right side of the heart receives blood from the veins in the body and pumps it through the pulmonary artery to the lungs.
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