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THE CELL
The cell is the basic structural, functional and biological unit of all known living organisms . Cells are the smallest unit of life that can replicate independently, and are often called the "building blocks of life". The starting point for this discipline might be considered the 1830s. Though scientists had been using microscopes for centuries, they were not always sure what they were looking at. Robert Hooke's initial observation in 1665 of plant-cell walls in slices of cork was followed shortly by Antonie van Leeuwenhoek's first descriptions of live cells with visibly moving parts. In the 1830s two scientists who were colleagues — Schleiden, looking at plant cells, and Schwann, looking first at animal cells — provided the first clearly stated definition of the cell. Their definition stated that that all living creatures, both simple and complex, are made out of one or more cells, and the cell is the structural and functional unit of life...
BLOOD CIRCULATION SYSTEM IN HUMAN
Blood circulation in humans by blood cells and blood vessels through . Therefore, it is called a closed circulation . Systemic blood circulation takes place (also called the circulation of the blood ) and pulmonary ( small circulation ) . A. TOOLS OF HUMAN BLOOD CIRCULATION Tools in human blood circulation consists of the blood , heart and blood vessels . All three have different functions . Transport system in humans there are two circulatory and lymph circulation (lymph nodes ) . 1 . Blood Blood functions : · As a means of transport nutrients and O2 to the whole body and the remains of metabolism for excretion tool . · Keeping the body temperature . · Circulate the water , in addition to nutrients circulate water also serves to maintain the enzymatic reaction to osmotic pressure or body . · Circulate lymph . · Protects the body from infection ( antibody forming cells such as white blood cells and blood clotting ) . · Maintain body temperature stabilit...
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