Advertisements
Advertisements
प्रश्न
Name different types of teeth and their number in an adult human.
Advertisements
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:
Succus entericus is the name given to
(i) a junction between ileum and large intestine
(ii) intestinal juice
(iii) swelling in the gut
(iv) appendix
How does pepsinogen change into its active form?
Describe the process of digestion of protein in stomach.
Describe the digestive role of chymotrypsin. What two other digestive enzymes of the same category are secreted by its source gland?
What would happen if HCl were not secreted in the 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 ______.
Mark the right statement among the following
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?
Name the enzymes involved in the breakdown of nucleotides into sugars and bases?
Correct the following statement by deleting one of entries (given in bold).
Saliva contains enzymes that digest starch/protein.
Correct the statement given below by the right option shown in the bracket against them.
Rennin is a proteolytic enzyme found in gastric juice in (infants/adults).
Correct the statement given below by the right option shown in the bracket against them.
Dipeptides, disaccharides and glycerides are broken down into simple substances in region of small intestine. (jejunum/duodenum)
How is the intestinal mucosa protected from the acidic food entering from stomach?
How are the activities of gastro-intestinal tract regulated?
Describe the enzymatic action on fats in the duodenum.
A person had roti and dal for his lunch. Trace the changes in those during its passage through the alimentary canal.
