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रासायनिक अभिक्रिया में एक या अधिक पदार्थ आपस में अन्तर्क्रिया (इन्टरैक्शन) करके परिवर्तित होते हैं और एक या अधिक भिन्न रासायनिक गुण वाले पदार्थ बनते हैं। किसीरासायनिक अभिक्रिया में भाग लेने वाले पदार्थों को अभिकारक (रिएक्टैन्ट्स) कहते हैं। अभिक्रिया के फलस्वरूप उत्पन्न पदार्थों को उत्पाद (प्रोडक्ट्स) कहते हैं।

प्रकाश संश्लेषण, पाचन, फलों का पकना, कागज का जलना आदि कुछ ऐसी प्रक्रियाएं हैं जो पदार्थ के संघटन के साथ-साथ उसकी रासायनिक प्रकृति में भी बदलाव कर देती हैं और एक नए पदार्थ का निर्माण करती हैं अतः ऐसी प्रक्रियाओं को रासायनिक अभिक्रिया कहा जाता है

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Human digestive system

Posted by Amaan Saifi 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

1 answers

Gaurav Seth 6 years, 1 month ago

Human Digestive System

A human digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body. The food we take in is digested and utilized by our body and the unused parts of the food are defecated. Human digestive system is the sum of the gastrointestinal tract (GIT; also called alimentary canal) and accessory organs (tongue, liver, pancreas, etc). These two parts together help in digestion in humans.

The alimentary canal is the long tube through which the food that we eat is passed. It begins at the mouth (buccal or oral cavity), passes through the pharynx, esophagus or food pipe, stomach, small intestines, large intestines, rectum and finally ends at the ****. The food particles get digested gradually as they travel through various compartments of the alimentary canal. Accessory organs are organs which participate in the digestion process but are not actually a part of GIT. They stimulate the digestion by releasing certain enzymes.

Food begins its journey through the digestive system in the mouth, also known as the buccal cavity or the oral cavity. The mouth has many accessory organs such as the tongue, teeth, and salivary glands, which help in the digestion of food. Teeth grind the food into small pieces. Salivary glands secrete saliva which contains an enzyme called the salivary amylase. This enzyme breaks down starch content and moistens the food, before the tongue and other muscles push the food into the pharynx.

Pharynx

The pharynx passes the chewed food from the mouth to the esophagus. The flap of tissue known as the epiglottis present in pharynx prevents food from entering into the wide pipe

Esophagus or Food Pipe

The esophagus is a muscular tube connecting the pharynx to the stomach. It carries swallowed masses of chewed food along its length and pushes it down to the stomach.

Stomach

The stomach is a thick-walled muscular bag that is located on the left side of the abdominal cavity. It is the largest part of the human digestive system. Stomach acts as a storage tank for food so that the body has time to digest large meals properly. It receives food from the food pipe at one end and opens into the small intestine at the other end. The inner walls of the stomach consist of the gastric glands which secrete mucous, hydrochloric acid and digestive enzymes. These continue the digestion of food that began in the mouth.

Mucous protects the lining of the stomach while acid kills bacteria that enter the body along with the food. Hydrochloric acid also makes the medium in the stomach acidic, which helps the digestive enzymes like pepsin to act. The digestive enzymes break down proteins into simpler substances.

Small Intestine

The small intestine is the longest part of the human digestive system. It is a highly coiled long, thin tube which is about 7.5 metres in length. The length of the small intestine depends on the diet of the organism. A major proportion of digestion takes place in the small intestines. All types of nutrients are digested here with the help of secretions which it receives from the liver and the pancreas. The walls of the small intestine also secrete juices for digesting food.

The liver releases bile juice which alkalizes the acidic food received from the stomach and also emulsifies the fat content. The pancreatic juice digests the proteins and lipids. Finally, the intestinal secretions convert the carbohydrates into glucose, proteins to amino acids and fats into fatty acids and glycerol.

Once the food is broken down into the simple particles, it is ready to be absorbed by the body. The villi, finger-like projections present on the walls of the small intestine, absorb the digested food by increasing the surface area. The absorbed food is then transported to different parts of the body through the blood vessels for cell activities.

Large Intestine

The large intestine is a long, thick tube which is about 1.5 meters long. The large intestine absorbs water and small amounts of nutrients from the undigested food with the help of many symbiotic bacteria residing in it. The remaining waste passes into the rectum, where it remains as semi-solid feces. Feces exit the body through the **** via time-to-time excretion. This process is called Digestion.

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chapter 1 question and answer

Posted by Komal Rana 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

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उद्दीपन अथाथ क्या

Posted by Bhavesh Choudhary 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

1 answers

Manisha Gupta 6 years, 1 month ago

Hamare aas paas paryavaran me jo kuch badlav hote hain jisse hum bahut teji me pratikriya karte hain use uddipan kehte hain

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Glucose. ka. Vikhdan. Ka. 3. Chran. Batya

Posted by Shweta. Jha Kumari 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

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Renu Rekwar 6 years, 1 month ago

1.oxygen ki upastithi me- vaiveeye respiration (in mytrokondri;human) 2.oxygen ki anupastithi me- avaiveeye shawashan (in yeast) 3.oxygen ki kami me- (in maspeshi (muscles) ) ?????i hope you will easily understand that

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Acche indhan ki visheshtayen bataye

Posted by Rani Kumari 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

3 answers

Renu Rekwar 6 years, 1 month ago

Vo sasta ,adhik matra me Orja dene vala,parivahan me aasani, seemit bhandar, pollution rahit hoga

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Mayank Yadav 6 years, 1 month ago

Aasani se prapt Hote Hain Inka Bhandara Aasan Hota Hai Ek Jagah se dusre Sthan par Lagaya Ja sakta hai

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Mayank Yadav 6 years, 1 month ago

Yeh Raste Hote Hain

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Wahat is the sira

Posted by Mohd.Shuaib Khan 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

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Sia ? 6 years, 1 month ago

परिसंचरण तंत्र में, शिरायें वे रक्त वाहिकायें हैं जो रक्त को हृदय की ओर ले जाती हैं।

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Renu Rekwar 6 years, 1 month ago

Ve ract vahikayen jo bina oxygen vaale ract ko dil tak pahuchati hain unhe shira kehte hain

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Question and Answer Ch 12

Posted by Priyanshi Gupta 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

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List three types of manure .how are these prepared ? Give any one advantage of organic manure over fertilizer

Posted by Abhishek Mallick 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

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Sia ? 6 years, 1 month ago

There are three types of organic manure: animal, green, and wood ashes.
Unlike the fertilizers, organic manures improve soil quality and promote crop growth.

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posan kya hai

Posted by Rohit Raj 6 years, 1 month ago

CBSE > Class 10 > विज्ञान

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Sia ? 6 years, 1 month ago

पोषण वह विशिष्ट रचनात्मक उपापचयी क्रिया जिसके अन्तर्गत पादपों में खाद्य्य संश्लेषण तथा स्वांगीकरण(गुण लगना) और विषमपोषी जन्तुओं में भोज्य अवयव के अन्तःग्रहण, पाचन, अवशोषण, स्वांगीकरण द्वारा प्राप्त उर्जा से शारीरिक वृद्धि, मरम्मत, ऊतकों का नवीनीकरण और जैविक क्रियाओं का संचालन होता है, सामूहिक रूप में पोषण कहलाती है।

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Q.8: सोलनॉइड चुंबक की तरह कैसे व्यवहार करता है? क्या आप करंट के उत्तर और दक्षिण ध्रुवों को निर्धारित कर सकते हैं- बार चुंबक की मदद से सोलनॉइड ले जाना? के बारे में बताएं। Ans एक सोलेनोइड इंसुलेटेड कॉपर वायर के सर्कुलर लूप्स का एक लंबा कॉइल है। जब एक धारा को इसके माध्यम से प्रवाह करने की अनुमति दी जाती है, तो सोलनॉइड के चारों ओर चुंबकीय क्षेत्र रेखाएं उत्पन्न होती हैं। इसके द्वारा उत्पन्न चुंबकीय क्षेत्र एक बार चुंबक के चुंबकीय क्षेत्र के समान है। वर्तमान-ले जाने वाली सॉलॉइड में निर्मित फ़ील्ड लाइनें निम्न आकृति में दिखाई गई हैं। उपरोक्त आकृति में, जब एक बार चुंबक के उत्तरी ध्रुव को बैटरी के ऋणात्मक टर्मिनल से जुड़े अंत के पास लाया जाता है, तो सोलनॉइड बार चुंबक को पीछे कर देता है। चूंकि डंडे एक दूसरे को पीछे हटाते हैं, बैटरी के नकारात्मक टर्मिनल से जुड़ा हुआ अंत सोलनॉइड के उत्तरी ध्रुव के रूप में व्यवहार करता है और दूसरा छोर दक्षिण ध्रुव के रूप में व्यवहार करता है। इसलिए, सोलेनोइड का एक छोर उत्तरी ध्रुव के रूप में और दूसरा छोर दक्षिणी ध्रुव के रूप में व्यवहार करता है।

Posted by Shubham Singh Sandhu 6 years, 1 month ago

CBSE > Class 10 > विज्ञान