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प्रश्न
Describe the human salivary gland.
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उत्तर
Salivary Glands - Three pairs in man and secrete 1000 to 1500 cc saliva per day. Saliva is slightly acidic and its pH is 6.8.
There are three types of salivary glands:
- Parotid glands: It is the largest salivary gland and situated near the ears. It opens into oral cavity by Stenoson's duct.
- Sublingual glands: It is located beneath the tongue. It opens into the floor of oral cavity by duct of Rivinus.
- Submadibular or sub-maxillary glands: It is situated at the angles of the lower jaws. It opens inot oral cavity by Whartson's duct.
Each gland secret secretes saliva which is transported to the mouth cavity. At the time secrete saliva.
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संबंधित प्रश्न
What substance is mixed with food in the mouth during chewing by the teeth?
Define a nutrient.
Describe one way in which the small intestine is adapted for the absorption of digested food.
The length of small intestine in a human adult is about ______.
In human digestive system, bile is secreted by ______.
Where are proteins first digested in the alimentary canal?
| If the teeth are not cleaned regularly, they become covered with a sticky yellowish layer W of food particles and bacteria. Since layer W covers the teeth, the alkaline liquid X secreted by glands Y inside the mouth cannot reach the teeth surface to neutralise the acid formed by the action of organisms Z on sugary food, and hence tooth decay sets in. |
- What is W known as?
- What are (i) X and (ii) Y?
- What are organisms Z?
- State one way of removing layer W from the teeth.
Study the diagram given below and then answer the question that follows:
Identify the tooth and give a reason to support your answer.
Fill in the blank.
Molars are meant for _____ the food.
Fill in the blank.
The _______ are used for tearing the food.
Fill in the blank.
The human teeth appear in two sets, the first set is called primary which consists of only _______ teeth
Name the three enzymes found in pancreatic juice.
(i)____ (ii)____ (iii)_____
What is the role of the liver and the pancreas respectively in the digestion of food?
Differentiate between
Small intestine and Large intestine
Observe the diagram given alongside and answer the following:
- Name the parts numbered 1-8.
- Which parts shown in the diagram are non-living?
- Is the tooth suited for cutting, tearing or grinding?
- What is the function of parts 8 and 7?
- What is the total number of teeth present in adult human beings?
- Write the dental formula of human beings.
Describe the following: Emulsification
The question has four options. Choose the correct answer:
The organ that stores bile is
Write down the explanation.
Explain why human dentition is considered as thecodont, diphydont and heterodont.
Observe the diagram. This is the histological structure of the stomach. Identify and comment on the significance of the layer marked by an arrow.
Mucosa forms __a__ in stomach and ___b___ in intestine respectively.
