Digestion in Human Beings for class 10th

Digestion

As the Human Beings show Holozoic mode of nutrition , theres is a system in Human Beings which Digests this food into the simple molecules called Gollucose.

Digestion:-The process in which an organism breaks complex food molecules into simpler once for respiration is called digestion.

Q.1 what is need to Digest food?
As the food is in complex form , body cells cannot use it directly so there is a need to change its form from complex to simple one.

Digestion in Human Beings

Digestion In Human Beings starts from mouth.The cavity inside the mouth is called as Buccal cavity.Buccal cavity contains Teeth and Tongue.In mouth food is broken into small pieces with the help of Teeth and is mixed with saliva secreated by Salivary gland. Saliva contains digestive enzymes called as Salivary Amilase (Ptylin).These enzymes digest food to some extend.Tongue in a mouth helps in mixing food with saliva and is also percieves the taste of the food.

The food than enters into the stomuch, a mascular bag like structure through food pipe or oesophagous.In the stomuch many types of digestive juices are added to food, An HCl in stomuch helps in break down of food further.HCl in stomuch is screated by oxyntic cells or peptic cells.

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Absorption of Nutrients in Small Intestines

The digested food is now in simple form and is ready to use by cells. The inner wall of small intestines is called as Mucosa, it has numerous finger like projections called as Villi (singular- villus), which in-turn has finger like projections called as micro-villi. The purpose of villus is to provide large surface area for nutrient absorption. Villi have large network of blood capillaries, where the nutrients are absorbed in blood by diffusion.Most of the nutrients are absorbed in jejunum. except Iron is absorbed in duodenum vitamin B12 and bile salts are absorbed in the terminal ileum. Through blood digested food reaches to each and every cell of the body.

Modes of Nutrition for 10th class

Modes of Nutrition in Organism 1. Autotrophic mode of nutrition:- In this mode of nutrition, organisms synthesize their own food by using simple raw materials from their environment . Examples are Plants , some bacteria, algae and euglina. It has following sub types Photo-autotrophic Nutrition:- In this mode of autotrophic nutrition organisms synthesize their own food by using simple raw material from their environment e.g carbon dioxide,water and sunlight. examples are Plants , Algae etc. These organisms have special units in their cell to trap sunlight called as Chloroplast which are green in color. chemo-autotrophic nutrition:- In this mode of nutrition organisms synthesize their food from some chemicals. e.g some bacteria ( sulfur-oxidizing bacteria , nitrogen-fixing bacteria ) KEEP LEARNING , KEEP SHINING see the next post for further

Photosynthesis for class 10th

● Photosynthesis ( Photo=Light) :-The biological process In which the plants synthesis their own food with the help of SunLight, Carbon Dioxide and water.It is the characteristic feature of plants. Photosynthesis takes place in the leaves of plants.where the sunlight is traped by green pigment chloroplast.Carbon Dioxide is taken from Atmosphere through Minute pore On leaves called stomata and water is absorbed by roots from soil and conducted to leaves through xylum to leaves. Oxygen is released after Respiration through stomata. Examine the below Diagram

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