Tag: introduction to human digestive system
Questions Related to introduction to human digestive system
The number of teeth that grow twice in human life is
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4
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12
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20
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28
The primary dentition in human differs from permanent dentition in not having one of the following type of teeth
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Canine
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Premolars
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Molars
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Incisors
There are 20 primary teeth which are lost as the child grows and is replaced by 32 permanent teeth. Primary dentition comprises of 8 incisors, 4 canines and 8 molars while permanent teeth comprises of 8 premolars in addition to newly formed 8 incisors, 4 canines and 12 molars. Premolars take the place of molars present in the primary dentition.
Find the odd out and state category of rest ;
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Thymine, Cytosine, Adenine, Pepsin
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Cortisone , Somatotropin, Adrenocorticotropic hormone, Vasopressin
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Cerebrum, Cerebellum, Thalamus, Hypothalamus
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Urea, Creatinine, Ammonia, Uric acid
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Neutrophils, Eosinophils, Basophils, Lymphocytes
(A)Pepsin is not a nitrogenous base.
The undigested, semisolid food is called
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Anus
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Faeces
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Rectum
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Villi
- The human digestive system consists of a long muscular tube and several accessory organs such as the salivary glands, pancreas and gall bladder.
- It is responsible for food ingestion and digestion, absorption of digestion products and the elimination of undigested materials.
- Undigested semi-solid food remaining in the large intestine is called faeces which are eliminated through the anus.
The longest part of the alimentary canal is
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Oesophagus
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Large intestine
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Small intestine
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Stomach
- The alimentary canal includes the mouth, pharynx, oesophagus, stomach, small intestine, large intestine, and anus.
- The longest part of the alimentary canal is small intestine because it is the main organ of absorption and digestion of food.
- The surface area of the small intestine gets increased because of the presence of villi which gives food plenty of time to break down properly. Hence, the longest part of the alimentary canal is a small intestine.
Stomach secretes
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Dilute hydrochloric acid
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Dilute sulphuric acid
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Dilute citric acid
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Dilute nitric acid
- Parietal cells in the stomach contain an extensive secretory network from which the dilute hydrochloric acid is secreted into the lumen of the stomach.
- This dilute Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then helps digestion by breaking the bonds linking amino acids, a process known as proteolysis. Hence, Stomach secretes Dilute hydrochloric acid'
Bile is secreted by
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Stomach
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Small intestine
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Pancreas
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Liver
- Bile is a dark green to yellowish brown fluid, produced by the liver of most vertebrates, that helps in the digestion of lipids in the small intestine.
- In humans, bile is produced continuously by the liver, and stored and concentrated in the gallbladder. Hence, Bile is secreted by the liver.
The inner layer of the stomach releases
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Water
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Blood
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Minerals
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Digestive juices
- The stomach is made of 4 layers. They are serosa, muscularis, submucosa, mucosa. These layers of smooth muscle consist of the outer longitudinal, the middle circular, and the inner oblique muscles.
- The innermost layer or lining (mucosa) contains the glands that release digestive juices which includes pepsin, chymotrypsin, hydrochloric acid etc. Hence, The inner layer of the stomach releases digestive juices.
Brunner's glands are present in submucosa of.
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Stomach
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Caecum
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Intestine
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Oesophagus
The stomach takes part in
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Breaking food mechanically
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Partially digesting the food
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Disinfecting the food
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All the above