Home School Subject: Biology Lesson: Breathing & Respiration Class: Seven (International) Questions: Copy and Complete: Respiration takes place in all our ………. The fuel used for respiration is ………... It is broken down to release ……………. Also produced are waste gas ………………………… and …………… When it takes place in the presence of oxygen it is called ……………….. respiration. These reactions take place in every living cells, including tiny structures called ……………………. All living organisms except trees inhale oxygen for respiration and exhale carbon dioxide produced as a waste product of respiration is called breathing. Respiration means the release of energy from glucose in living cells happening all the time. Breathing and respiration is important for our healthy growth and development of nervous, muscular and respiratory systems, to keep the body temperature constant (homeostasis) and building and repairing cells. Respiration happens all the time in every living organisms including the tiny mitochondria and the rate of respiration can be measured with a respirometer. During daylight plants produce more oxygen due to the presence of sunlight and chlorophyll, plants are able to keep photosynthesis alive with the organic and raw materials like carbon dioxide and water and produces glucose, a kind of sugar and food of plant and oxygen. During night time plants will respire more carbon dioxide out due to the absence of sunlight at night and its universal truth. Glucose + Oxygen Carbon dioxide + Water + C6H12O6 + 6O2 6CO2 + 6H2O + Energy Diagram: Breathing & Respiration (Animals) Carbon dioxide + Water Sunlight energy 6CO2 + 6H2O & Chlorophyll Glucose + Oxygen C6H12O6 + 6O2 Diagram: Breathing & Respiration (Plants) Fermentation Many microbes and other micro living organisms can respire successfully without oxygen. Yeasts and muscles can respire without oxygen. This is kind of respiration is known as anaerobic respiration. Glucose Ethanol + Carbon dioxide + Energy When there is no oxygen during respiration then the glucose is broken down to lactic acid. Glucose Lactic acid + Energy Human Respiratory System Our lungs are our respiratory organs. There is a pair of lung located inside our chest or thorax. There is a sheet of muscles below our lungs called diaphragm. It separates our lungs of our abdomen below. We use our intercostal muscles and diaphragm during respiration. Warmed, cleaned, pure, moistened and fresh air enters inside our windpipe or trachea below our throat. The trachea and the windpipe make slimy mucus. These cells have tiny hairs on the lining called cilia. Exchange of gases takes place in the air sacs of the lungs. Our breathing rate is controlled by the brain and increases with exercise. The larynx is also known as the voice box which help us to produce sound. The epiglottis opens the dropping of larynx and trachea. These are supported by rings of cartilage and C shaped. The windpipe is divided into two. Each containing branches like of a tree called bronchus and tiny bronchioles and alveoli is at the end of these.
Posted on: Mon, 29 Jul 2013 19:17:09 +0000
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