human resources organization

Introduction - Living organisms are exposed to various external or foreign substances and disease causing organisms like bacteria, viruses and fungi. Such organisms which can cause a disease are known as Pathogens. It is observed that some human beings are mo..

Gaseous Exchange in Human Beings - In human beings, the respiratory organs are the lung..

Introduction - Although population of some animals is also studied, the population of human beings is most extensively studied. Whenever the word population is used, it connotes the human population. Population is one of the most important subjects known for having large scale r..

Human Digestive System - Man is omnivorous - feeding on different kinds of food. Thus, the structure of the digestive system should be adapted to this diet. The human digestive system consists of an alimentary canal, which is approximately 8metres long. The alimentary canal also..

It is a sac-like organ which is connected to the oesophagus at the anterior by a cardiac sphincter and to the small intestine at the posterior end by a pyloric sphincte..

Introduction - Transportation whether in plants or animals is the key to the efficient assimilation of the nutrients that the organisms synthesise, get from their environment or diges..

In human beings, sexual reproduction takes place. Sexes are separate and hence they are known to exhibit sexual dimporphism. Males have sex organs called the tetes while the females have sex organs called the ovaries. Even in the external appearance, males and females ..

Female Reproductive System in Human - The human female reproductive system performs the following functions: a) Formation of eggs b) Reception of sperms during copulation c) Providing a conducive environment for fertilisation d) Providing shelter and nourishment to the growing e..

Functions - The nervous system carries out the following functions i) It perceives the changes around us through our senses. ii) It controls and coordinates all the activities of the muscles in response to the changes outside. iii) It also maintains the internal environment of the body by coordinat..

The closed circulatory system can be represented as follows. Diagram showing inter-relationship between artery, vein and capillary The closed blood vascular system is a very well developed system This is so because, a) The organisms have a thick body wall to prevent the evaporation of wat..