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51.

How is the tongue attached to the floor of the buccal cavity?

Answer»

The tongue is attached to the floor of the buccal cavity by frenulum.

52.

What are the two major functions of buccal cavity?

Answer»

Buccal cavity helps in mastication of food and facilitates in swallowing.

53.

Write the names of major parts of stomach.

Answer»

Cardiac, fundic, pyloric.

54.

What is the function of epiglottis?

Answer»

Epiglottis prevents the entry of food into the trachea during swallowing.

55.

Mention the function of epiglottis.

Answer»

Prevention the entry of food into the glottis.

56.

Give the dental formula of human beings.

Answer»

In human beings, each half of the upper and lower jaw has teeth in the order I, C, PM, M as represented by following dental formula:

2123/2123.

57.

Describe the process of digestion of protein in stomach.

Answer»

The proenzyme pepsinogen gets converted into the active enzyme pepsin; on exposure to hydrochloric acid. Pepsin converts proteins into proteoses and peptones (peptides).

Pepsinogen + HCl Pepsin + protein proteose + peptone.

58.

Describe the process of digestion of protein in stomach.

Answer»

The proenzyme pepsinogen present in the stomach gets converted to proteolytic enzyme pepsin in presence of Hydrochloric acid. Pepsin converts proteins into proteoses and peptones. Rennin is another proteolytic enzyme present in gastric juice of infants which help in digestion of milk proteins.

59.

What would happen if HCl were not secreted in the stomach?

Answer»

Acidic medium is necessary for the action of gastric enzymes. Moreover, it also kills various microbes which may be present in food. These actions would not be possible in the absence of hydrochloric acid.

60.

What is the other name for Pancreatic amylase?

Answer»

Amylopsin is the other name for Pancreatic amylase.

61.

Which is non digestive activating enzyme?

Answer»

Enterokinase

62.

Which glands secrete HCI?

Answer»

Gastric glands

63.

Which gland secretes Bile?

Answer»

Liver gland secretes Bile.

64.

What are the end products of protein digestion?

Answer»

Amino   acids

65.

What Is Chyme?

Answer»

The liquified and acidified food present in the stomach is called as chyme.

66.

Mention the function of microvilli.

Answer»

The chief function of the microvilli is absorption (i.e., it increases the surface of absorption).

67.

What Is emulsification?

Answer»

Emulsification is a process by which fats are converted to small water soluble miscles by Bile salts making them easily accessable to the action of Fats digesting enzymes called lipases.

68.

What is emulsification ? Where and how does it occur ?

Answer»

The process of breakdown of large fat droplets into smaller ones. It occurs in small intestine. It is brought about by bile salts through reduction of surface tension of large fat droplets.

69.

Why are proteases generally released in inactive form ?

Answer»

If released in active form, they will start digesting the membranes and muscular walls of the alimentary canal.

70.

Name the three parts of colon.

Answer»

Ascending, transverse and descending part.

71.

Name the part of the alimentary canal where symbiotic microbes live.

Answer»

Caecum symbiotic microbes live

72.

Name the muscular structure that guards the opening of stomach Into duodenum.

Answer»

Mr.-Pyloric sphincter

73.

Which part of the stomach continues into the duodenum?

Answer»

Pyloric  region

74.

Choose the correct answer among the following:Succus entericus is the name given to(i) A junction between the ileum and large intestine(ii) Intestinal juice(iii) Swelling in the gut(iv) Appendix

Answer»

(ii) Intestinal juice

75.

Name an enzyme present in saliva meant for killing bacteria.

Answer»

Lysozyme present in saliva meant for killing bacteria.

76.

What Is succus entericus?

Answer»

Succus entericus is the intestinal juice made of water, mucin and 7 digestive enzymes.

77.

Mention two characteristic of mammalian teeth.

Answer»

Heterodont and thecodont.

78.

Give reason:In the absence of Enterokinase, protein digestion is incomplete.

Answer»

Enterokinase activates trypsinogen to trypsin which breaks down proteins. Hence absence of enterokinase results in nondigestion of proteins.