human cellular organisation

One of the main characteristics used in defining grades of animal complexity is the presence or absence of tissues. Tissues are the aggregations of embryologically and morphologically similar cells that become arranged to perform specific functions. The protozoans occur as single cells or colonies ..

Animal Organisation - Animals exhibit a complex body organisation which shows a very clear evolutionary trend. The complexity of animal organisation is seen with reference to features like cellularity, germ layers in the body wall, symmetry of the body parts ..

The molecules of various chemical substances in a specific proportion become organised into protoplasm - the physical basis of life. The protoplasm gets organised into cells, which represents the structural and functional unit of life. A living organism may have a single cell (..

It takes places within the cells of an organism. biochemical processes involved in respiration break down the substate to release energy in the tissues within the cells of the organism. Thus it is called cellular respiration. Gaseous exchange in plants takes place through the stomata..

Summary - 1) The human body has elaborate mechanisms for protection against foreign bodies, germs and cancer cells. 2) Immunity is either innate or acquired. 3) Innate or non-specific immunity refers to a wide variety of body responses against a wide range of pathogens. 4) Previous exposu..

Bilaterally symmetrical, triploblastic true multi-cellular animals with organ grade of organisation. Free living (aquatic or terrestrial) or parasitic (ecto- or endoparasites..

Human cellular respiration can be divided into 2 main phase..

Mechanism of Respiration - Human cellular respiration can be divided into 2 main phases. a) Glycolysis b) Kreb's cycle The Broad Scheme of Respiration The Steps of Respiration at a Gla..

A chemical or other environmental agent that produces cancer is called a carcinogen. The world Health organisation estimates that carcinogens may be associated with 60 - 90% of all human cance..

Living organisms, like any non-living matter, are composed of some basic elements. The same physical laws such as gravitation, magnetism, thermodynamics etc., also bind living organisms. Yet, living organisms differ from non-living in fundamental characteristics such as cellular ..