human body body pulley systems

The organisms have a thick body wall to prevent the evaporation of water, so exchange of materials between the body cells and the environment by diffusion is not possibl..

Closed Circulatory System in Humans - 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 beca..

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 more prone to a certain disease..

It controls and coordinates all the activities of the muscles in response to the changes outside. It also maintains the internal environment of the body by coordinating the functions of the various internal organs and the involuntary muscle..

The nervous system carries out the following functions: It perceives the changes around us through our senses. It controls and coordinates all the activities of the muscles in response to the changes outside. It also maintains the internal environment of the body by coordinating..

A section taken through any region of a typical plant body shows the presence of three tissue systems, namely Epidermal tissue system Ground tissue system and Vascular tissue syst..

The epidermis usually forms projections known as epidermal hairs. In the root, the epidermal hairs are unicellular and are called as root hairs. The root hairs penetrate between the soil particles to absorb water. In the stem and the leaf, the epidermal hairs are multicellular and are known a..

Circulatory System - The transport system in animals is called the circulatory system. The materials are transported from one part of the body to another by a mass flow system which is the circulatory system. The animals, particularly the ..

Nervous Control in Human Beings - Nervous System - The nervous system carries out the following functions: It perceives the changes around us through our senses It controls and coordinates all the activities of the muscles in response to the changes outside It also mai..