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Observe the diagram. This is the histological structure of the stomach. Identify and comment on the significance of the layer marked by an arrow. - Biology

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प्रश्न

Observe the diagram. This is the histological structure of the stomach. Identify and comment on the significance of the layer marked by an arrow.

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उत्तर

The layer marked in the diagram represents glandular epithelium of mucosa.
Significance of the glandular epithelium of mucosa:
Goblet cells of the epithelial layer of a mucous membrane secrete mucus which lubricates the lumen of the alimentary canal. This helps in movement of food through the gastrointestinal tract.

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अध्याय 14: Human Nutrition - Exercise [पृष्ठ १७२]

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बालभारती Biology [English] Standard 11 Maharashtra State Board
अध्याय 14 Human Nutrition
Exercise | Q 5 | पृष्ठ १७२

संबंधित प्रश्न

What is the name of the opening in the human body though which undigested food is thrown out?


Fill in the following blank with suitable word :

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 What is meant by life processes? Name the basic life processes common to all living organisms which are essential for maintaining life.


Which part of alimentary canal receives bile from the liver?

(a) oesophagus
(b) small intestine
(c) stomach
(d) large intestine


The partially digested food coming from the stomach of a person enters a long and narrow organ A in his body. The organ A receives the secretion of two glands : liver and pancreas. Liver secretes a greenish-yellow liquid B which is normally stored in the organ C. Pancreas secretes pancreatic juice which contains three digestive enzymes D, E and F. The intestinal juice completes the process of digestion of food. The inner wall of organ A has millions of tiny finger-like projections G which help in the rapid absorption of digested food into blood stream. The undigested part of food then passes into wider tube H which absorbs most of the water from undigested food. The last part of tube H called I stores this undigested food (or waste) for some time. The undigested food is then passed out though opening J as faeces in the process known as K.

(a) Name the organ A.

(b) Name (i) liquid B, and (ii) organ C.

(c) What are the digestive enzymes D, E and F?

(d) Name the projections G present on the inner wall of organ A.

(e) Name (i) tube H (ii) part I (iii) opening J, and (iv) process K.


Define the following term : 

Pylorus


Study the diagram given below and then answer the question that follows:

Give the total number of the type of tooth mentioned in '1' above, in the mouth of an adult and state its function.


Study the following dental formula and then answer the question that follow:

`"i"  3/4   "c"   0/0   "pm"   0/1   "m"   1/1`

State the total number of teeth present in the dentition. 


Write the function of the following in the human alimentary canal:

HCl in stomach


Fill in the blanks.

Incisors are used for _____ and _____ the food.


Name the three enzymes found in pancreatic juice.
(i)____ (ii)____ (iii)_____


Name the three regions of the large intestine.


Name the digestive juice secreted by the stomach and give its function.


Name the types of teeth seen in humans.


Fill in the blanks.

Grinding of food is brought about by _______ and ______


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Define with examples: Herbivores


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Describe the digestion of starch.


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Which sphincter guards the opening of the hepato-pancreatic duct?


Identify which three of the following terminologies is true for human dentition.


Choose the odd one:


Which part of the alimentary canal receives bile from the liver?


Explain the role of the mouth in digestion of food.


Name the parts of the alimentary canal where water gets absorbed from undigested food.


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