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Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
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The definition of precipitation is any form of water - liquid or solid - falling from the sky. It includes rain, sleet, snow, hail and drizzle plus a few less common occurrences such as ice pellets, diamond dust and freezing rain.
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a weight hung from a fixed point so that it can swing freely, especially a rod with a weight at the end that regulates the mechanism of a clock.
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Plane mirrors and convex mirrors only producevirtual images. Only a concave mirror is capable of producing a real image and this only occurs if the object is located a distance greater than a focal length from the mirror's surface. The image of an object is found to be upright and reduced in size.
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The right side of the heart pumps blood to the lungs to pick up oxygen. The left side of the heart receives the oxygen-rich blood from the lungs and pumps it to the body. The heart has four chambers and four valves and is connected to various blood vessels.
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| RBC – Red Blood Cells | WBC – White Blood Cells |
| Red blood cells are called Erythrocytes. | White Blood Cells are called Leucocytes or Leukocytes. |
| RBCs have a bi-concave disc shape | WBCs have an irregular shape. |
| Size varies from 6 – 8 µm in diameter. | Size varies from 12 – 17 µm in diameter. |
| The lifespan of RBC is about 120 days. | The lifespan of WBC is around 12-20 days after which they are destroyed in the lymphatic system |
| Red blood cells do not have a nucleus on maturity. | WBCs are characterized by the presence of a large central nucleus. |
| Due to the presence of haemoglobin, these cells appear red in colour. | These cells are colourless, as they do not have any pigment. |
| Only one type of RBC exists. | Different types of WBCs are found in the blood such as neutrophils, B lymphocytes, T lymphocytes, monocytes, basophils, eosinophils. |
| They help in the transport of respiratory gases to different parts of the human body | They help in producing antibodies to fight against disease-causing microbes. |
| RBCs are produced in the red bone marrow | These cells are produced in the red bone marrow, lymph nodes, and spleen. |
| The components of red blood cells are haemoglobin. | The components of white blood cells are antibodies with the presence of MHC (major histocompatibility complex) antigen cell markers. |
| These cells make up around 36-50% of human blood. | They make up around 1% of the human blood. |
| RBC count: 5 million/ mm³ of blood. | WBC count: 7000–8000/mm³ of blood. |
| The process of formation of RBC is known as erythropoiesis. | The process of formation of WBC is known as leukopoiesis. |
| These cells move between the cardiovascular systems. | These cells move between the cardiovascular and lymphatic systems. |
| Low count of RBCs results in Anaemia. | Low count of WBCs results in Leukopenia. |
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