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Magnesium, being a reactive metal in the activity series, gets easily reacted when comes in contact with oxygen. Thus magnesium oxide is formed.In order to get appropriate results, it has to be cleaned, so that magnesium oxide is removed and the experiment is successfully performed.
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Life processes are the vital processes carried out by living organisms in order to maintain and sustain life. Molecular movements are essential to carry out the various life processes. Thus the processes which together perform the maintenance job are called life processes. Energy required to carry out the different life processes, is obtained through the process of nutrition. A series of chemical reactions in the body are necessary to obtain energy. Oxidising-reducing reactions are some of the most common chemical means to break-down molecules. The process of acquiring oxygen from outside the body, and to use it in the process of break-down of food sources for cellular needs, is called respiration. In the case of a single-celled organism, no specific organs for taking in food, exchange of gases or removal of wastes may be needed because the entire surface of the organism is in contact with the environment. In multi-cellular organisms, various body parts have specialised in the functions they perform.
The basic functions performed by living organisms to maintain their life on this earth are called life processes. The basic life processes common to all living organisms are – Nutrition and Respiration; Transport and Excretion; Control and Coordination; Growth; Movement and Reproduction.
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The microscopic organisms like yeast and some bacteria obtain energy by anaerobic respiration (which is called fermentation). In anaerobic respiration, the microorganisms like yeast break down glucose (food) into ethanol and carbon dioxide, and release energy.
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Yogita Ingle 6 years, 2 months ago
Working of Heart
The right atrium receives blood from the upper and lower body through the superior vena cava and the inferior vena cava, respectively, and from the heart muscle itself through the coronary sinus. The right atrium is the larger of the two atria, having very thin walls. The right atrium opens into the right ventricle through the right atrioventricular valve(tricuspid), which only allows the blood to flow from the atria into the ventricle, but not in the reverse direction.
The right ventricle pumps the blood to the lungs to be reoxygenated.
The left atrium receives blood from the lungs via the four pulmonary veins. It is smaller than the right atrium but has thicker walls. The valve between the left atrium and the left ventricle, the left atrioventricular valve(bicuspid), is smaller than the tricuspid. It opens into the left ventricle and again is a one-way valve.
The left ventricle pumps the blood throughout the body through the aorta, which is the largest artery in the body. The walls of the left ventricle are the thickest among all the chambers.
Posted by Deepak Singh 6 years, 2 months ago
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Meghna Thapar 6 years, 1 month ago
When magnesium ribbon is heated, it burns in air to form a white powder called magnesium oxide.
2Mg + O2
2MgO
Mg oxidizes and emits a bright white light, rich in ultraviolet and hard to extinguish.
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Ingestion: The process of taking food into the body is called ingestion.
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Posted by Sunil B Sunil 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
- Elements are arranged in order of their increasing atomic numbers.
- The vertical columns are known as groups and horizontal columns are known as periods; in the modern periodic table.
- There are 18 groups and 7 periods in the modern periodic table.
Santhosh Thegreat 6 years, 2 months ago
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Jasmandeep Kaur 6 years, 2 months ago
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