Page 40 - Viva ICSE Science 4 : E-book
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TERMS TO KNOW

                         1.  Digestion:The process  by which food is broken down into simpler forms so that it can be
                             easily absorbed by the body
                         2.  Saliva: Watery substance produced in the mouth that makes the food soft and helps to
                             swallow easily

                         3.  Oesophagus: Also known as food pipe, it helps to carry food and liquids from mouth to
                             stomach
                         4.  Liver: Produces digestive juice which helps in digestion of food and absorption of
                             nutrients
                         5.  Excretion: The process of removal of wastes from the body

                         6.  Kidneys: Filter and remove wastes, salts and extra water from the blood; also fi lter blood
                             to produce urine
                         7.  Ureters: Thin tubes that carry urine from kidneys to the urinary bladder

                         8.  Urinary bladder: Stores urine before it is excreted out of the body
                         9.  Urethra: Tube that carries urine from the bladder to the outside of body
                         10.  Faeces: Wastes which are expelled from the body




                        QUICK LOOK

                          1.  The process by which food is broken down into simpler form to be easily absorbed by the
                             body is known as digestion.
                          2.  The digestive system comprises of the mouth, food pipe, stomach, liver, small intestines,
                             large intestines and the anus.

                          3.  The digestive process begins in the mouth and ends in the anus.
                          4.  The blood absorbs the nutrients of the food and carries it to all parts of the body.
                          5.  The waste or faeces is expelled out of the body through the anus.

                          6.  Chewing food properly is an important step in digestion.
                          7.  A regular bowel movement is very important to maintain proper functioning of the body.

                          8.  The process of removal of wastes from the body is known as excretion.
                          9.  The excretory system consists of a pair of kidneys, a pair of ureters, a urinary bladder and
                             urethra.
                         10.  Kidney fi lters and removes wastes, salt and extra water from the blood to produce urine.

                         11.  Urine passes through ureters to urinary bladder. It is discharged out of the body through
                             urethra.
                         12.  Developing healthy food habits helps in proper digestion and excretion.

                         13.  Water is essential for absorption of nutrients by the body.




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