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प्रश्न
Name different types of teeth and their number in an adult human.
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उत्तर
There are four different types of teeth in an adult human. They are as follows:
(i) Incisors
The eight teeth in the front are incisors. There are four incisors each in the upper jaw and the lower jaw. They are meant for cutting.
(ii) Canines
The pointy teeth on either side of the incisors are canines. They are four in number, two each placed in the upper jaw and the lower jaw. They are meant for tearing.
(iii) Premolars
They are present next to the canines. They are eight in number, four each placed in the upper jaw and the lower jaw. They are meant for grinding.
(iv) Molars
They are present at the end of the jaw, next to the premolars. There are twelve molars, six each placed in the upper jaw and the lower jaw.
Hence, the dental formula in humans is = `2123/2123 xx 2 = 32`
This means each half of the upper jaw and the lower jaw has 2 incisors, 1 canine, 2 premolars, and 3 molars. Hence, an adult human has 32 permanent teeth.
संबंधित प्रश्न
Choose the correct answer among the following:
Gastric juice contains
(i) pepsin, lipase and rennin
(ii) trypsin lipase and rennin
(iii) trypsin, pepsin and lipase
(iv) trypsin, pepsin and renin
Match column I with column II
| Column I | Column II | ||
| a | Bilirubin and biliverdin | 1 | Parotid |
| b | Hydrolysis of starch | 2 | Bile |
| c | Digestion of fat | 3 | Lipases |
| d | Salivary gland | 4 | Amylases |
How does pepsinogen change into its active form?
Describe the process of digestion of protein in stomach.
How does butter in your food gets digested and absorbed in the body?
Which of the following sphincter controls the passage of food into the stomach?
Emulsification of fats is brought about by ______.
The food mixes thoroughly with the acidic gastric juice of the stomach by the churning movements of its muscular wall. What do we call the food then?
Trypsinogen is an inactive enzyme of pancreatic juice. An enzyme, enterokinase, activates it. Which tissue/ cells secrete this enzyme?/ How is it activated?
Name the enzymes involved in the breakdown of nucleotides into sugars and bases?
Define digestion in one sentence.
Correct the following statement by deleting one of entries (given in bold).
Fats are broken down into di- and monoglycerides with the help of amylase/ lipases.
Correct the following statement by deleting one of entries (given in bold).
Saliva contains enzymes that digest starch/protein.
How is the intestinal mucosa protected from the acidic food entering from stomach?
How are the activities of gastro-intestinal tract regulated?
