Digestive System : Working

Digestion is a catabolic process which involves breakdown of large, complex and insoluble food molecules into small, simple and soluble food molecules with the help of enzymes present in the digestive juices.

Digestive system consists of alimentary canal and digestive gland.

The main parts of alimentary canal are: mouth, oral cavity, pharynx, oesophagus, stomach, small intestine, large intestine, rectum and anus.

The mouth or mouth cavity is comprises of tongue, teeth and lips.

There are four types of human teeth: incisors, canines, molars and premolars.

Saliva is secreted by three pairs of salivary glands namely parotid, submaxillary and sublingual.

Ingestion is the process of taking food into the body through mouth. Bolus in oesophagus moves forward with the help of muscular contractions called peristalsis.

Digestive glands secrete digestive juices which help in digestion of food. Pepsin digests proteins into peptides.

Stomach is a muscular organ which receives food from the oesophagus.

Food in the stomach is churned into a pulp like form, known as chyme.

Liver is the largest gland which is situated just below the diaphragm in abdominal cavity. Bile is a yellowish green fluid produced by liver. Bile is transported through hepatic duct. Pancreatic juice is produced by pancreas.

Absorption is the process by which the end products of digestion pass through the intestinal mucosa into blood or lymph. After absorption of water, the undigested and unabsorbed contents turn into semi-solid faeces which pass into the rectum and are expelled at regular intervals. The process is called defecation.

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  • Q1

    We have ____ permanent teeth in our mouth, which can be categorised into four different types.

    Marks:1
    Answer:

    32

    Explanation:

    We have 32 permanent teeth in our mouth, which can be categorised into four different types. These include incisors, canines, premolars and molars.

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  • Q2

    During _____ digestion, food is broken down from large pieces into smaller ones by mouth.

    Marks:1
    Answer:

    Mechanical

    Explanation:

    During mechanical digestion, food is broken down from large pieces into smaller ones by mouth. After chewing the food, the food particles become quite smaller, rounded and easy to be swallowed.

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  • Q3

    The process of intake of food in our mouth is known as ______.

    Marks:1
    Answer:

    Ingestion

    Explanation:

    The process of intake of food in our mouth is known ingestion. After ingestion, the food undergoes both chemical and mechanical digestion by the various components of our digestive system.

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  • Q4

    ______is a process which is carried out in our body through a series of tubes and cavities, which together form the digestive system.

    Marks:1
    Answer:

    Digestion

    Explanation:

    Digestion is a process which is carried out in our body through a series of tubes and cavities, which together form the digestive system. It is a catabolic process.

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  • Q5

    Food enters the digestive system, once we take it in our _____.

    Marks:1
    Answer:

    Mouth

    Explanation:

    Food enters the digestive system, once we take it in our mouth. It is further broken down by the various components of the digestive system, so that it can be used by the body.

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