Science > Biology > Human Anatomy and Physiology > Cardiovascular System > Composition of Blood: Erythrocytes When a human blood sample is prevented from clotting and spun in a test tube (centrifuged), in a machine called a centrifuge, the blood separates into a straw coloured liquid called plasma and a dark brown mass of blood […]
Science > Biology > Human Anatomy and Physiology > Cardiovascular System > Composition of Blood: Blood Plasma When a human blood sample is prevented from clotting and spun in a test tube (centrifuged), in a machine called a centrifuge, the blood separates into a straw coloured liquid called plasma and a dark brown mass […]
Science > Biology > Human Anatomy and Physiology > Cardiovascular System > The blood, an Overview In the Cardiovascular system, the ‘‘heart’’ (cardi) pumps the blood in a ‘‘little circle’’ (circul), which travels through ‘‘little vessels’’ (vascul). In human, the transportation is done through blood circulatory system and lymphatic system. Thus two fluids move through […]
Science > Biology > Human Anatomy and Physiology > Cardiovascular System > Circulatory System and its Function In living things, many substances such as food, gases, minerals salts, hormones and waste products have to be transported from one part of the body to another. Plants and animals have a system of transporting substances throughout their body. […]
Science > Biology > Digestion and absorption in Human > Nutrition Energy is required by living beings for performing different activities. Energy is contained in the food. Food can be defined as a collection of chemicals taken by an organism for the purpose of the growth, repair, and replacement of body cells, energy releases, and […]
Photosynthesis is an important activity that occurs in all green plants, whether flowering or non- flowering. It is the only process by which solar energy is converted into chemical energy. Photosynthesis may be defined as the synthesis of carbohydrates by the green organs (containing chlorophyll) of a plant in presence of sunlight from carbon dioxide […]
Science > Biology > Applied Biology > Human Health and Diseases > Transmission and Types of Communicable Diseases Transmission of Communicable Diseases Infectious diseases can be transmitted either directly or indirectly Direct transmission of Diseases: In this case, the pathogens are transmitted from an infected person to a healthy person directly without any intermediate agent. […]
Science > Biology > Applied Biology > Human Health and Diseases > Communicable or Infectious Diseases Communicable diseases are those diseases which spread from one person to another through a variety of ways that include: contact with blood and bodily fluids; breathing in an airborne virus; or by being bitten by an insect. They are […]
Science > Biology > Applied Biology > Human Health and Diseases > Disease A major cause of ill health is ignorance, for example, ignorance about a balanced diet, or about the harmful effect of tobacco and alcohol. To achieve and maintains good health, basic knowledge about the body should be a part of education. Good […]
Science > Biology > Applied Biology > Human Health and Diseases > Community Hygiene Some health measures can be undertaken only by the community as a whole. Community hygiene includes water source protection, proper disposal of solid waste and excreta, wastewater drainage, controlling animal rearing and market hygiene. It is the responsibility of the community leader with legal […]