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प्रश्न
Name the types of teeth seen in humans.
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उत्तर
Human teeth are of four kinds:
- Incisors are the four front teeth at the middle of each jaw. They are chisel-shaped for biting and cutting.
- Canines are one on either side of the incisors in each jaw. They are pointed for tearing the food.
- Premolars are two on each side of canines in each jaw. They help in crushing and grinding the food.
- Molars are the last three teeth on each side in each jaw. They have a broad uneven surface for finer crushing and grinding of ingested food.
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संबंधित प्रश्न
Describe the parts of our tooth with the help of a labelled diagram.
The process of digestion in humans is completed in:
(a) oesophagus
(b) small intestine
(c) stomach
(d) large intestine
Where are proteins first digested in the alimentary canal?
(a) small intestine
(b) oesophagus
(c) mouth
(d) stomach
When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is and enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
(a) What is (i) gland A (ii) substance B, and (iii) enzyme C?
(b) Name the tube D.
(c) What is the movement E known as?
(d) What are (i) F (ii) G, and (iii) H?
With which human organ system (or human systems) is villi associated?
Name the three enzymes found in pancreatic juice.
(i)____ (ii)____ (iii)_____
Food are classified into three groups on the basis of the function they perform in our body. Name the three categories, and briefly give their functions. Also give their two sources each.
Describe the human alimentary canal.
The contraction and expansion movement of the walls of the food pipe is called ____________.
In which part of the alimentary canal food is finally digested?
