notes in biology

May 20th, 2015
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1. Father of cytology is Robert hooke. 2. Cell is the Fundamental, structural and functional unit of all living organisms. 3. Robert hook discovered cell in 1665. 4. Simple microscope, compound microscope and electron microscope are discovered respectively by Anton-von-leeuwenhock, francis and zacharis jonnson, knell and ruska.

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ROUGHAGE OF DIETARY FIBRES: Dietary fibre refers to the indigestible part of plant food which consists mainly of cellulose. Roughage passes through out of the alimentary canal in the faeces without being has the following function that is to provide bulk to the intestinal contents because of this water holding capacity, aid in peristalsis. Peristalsis is the rhythmic contraction of muscles along the walls of the alimentary canal. Besides that, in bowel movement, this prevents the build-up of toxic substance in the rectum which can lead to bowel cancer. Lower of the cholesterol level in the bloods helps to reduce the risk of heart disease and colon cancer. Deficiency of dietary fibre can lead to constipation. Constipation occurs when the undigested matter cannot move along fast enough in the large intestine. As a results, two much water will be absorbed and the faeces become hard and dry. This makes the removal of faeces through the anus painful and difficult.WATER Water is very essential to the survival of human as all metabolic reactions in the human body take place in saluting. Water makes up about 70% of the total body weight. Water is the medium for all cellular biochemical reactions. Water is the medium of transportation for respiratory gases and nutrients. Also regulates body temperature, removes excretory waste such as lactic acid, urea and excess minerals salts through perspiration and urination. For our body to function efficiently, we need to m

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