British physiologist William Harvey (1628) first of all expressed the plan of special type of system within the body. This system is called the blood circulatory system. In our body, this special system perform several functions like carrying food substances, respiratory gases, excretory wastes, and control body temperature and metabolic activities, prevent infection and coordinate … Read more
Virus is an infectious agent with microscopic size that needs living cells of plants, animals or bacteria to multiply. The name virus is derived from Latin word meaning “poison” or “slimy liquid”. There are various economic importance of viruses. It is used in preparation of sera and vaccines to prevent various diseases. They are not … Read more
Gametes are produced by the animals through meiosis cell division from diploid mother cells (gonads). There are two types of gonads such as testis in males and ovaries in females. The process of gamete production (ovum and sperm) is known as gemetogenesis (Gr. Gamos=marriage; genesis=origin). Testes produce male gametes or sperms through the process of … Read more
Syphilis is a sexually transmitted infection. It is the top list disease of the world. This disease is mostly spread out through various sexual activities such as oral, anal sex and by kissing. The outbreak of syphilis was first occurred in Italy in 1495-1495 during a French invasion. Hence, it is also known as the … Read more
Aerobic respiration is the process by which complete oxidation of respiratory substrate occurs. In this case, respiratory substrate glucose breaks down in the presence of oxygen resulting in the end products of CO2 and H2O. Most of the cells perform the respiration through aerobic process. Aerobic respiration occurs by completing the series of chemical reactions. … Read more
Aquarium plants enhance the natural beauty, improve the tank water quality and provide security and shelter for your fish. Many fish use aquarium plants to make spawning areas during reproduction. Besides these, aquarium plants act as great filtration to remove waste products from the tank. Plants also release oxygen into water and absorb CO2 created … Read more