Tag: introduction to human digestive system

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Multiple choice evs structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

The number of teeth that grow twice in human life is 

  1. 4

  2. 12

  3. 20

  4. 28
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

20 milk teeth of a child get replaced in adulthood by 20 permanent teeth. But the rest 12 can never be replaced if broken, these 12 teeth grow only once in a man’s life.
So, the correct option is '20'.
Multiple choice evs structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

The primary dentition in human differs from permanent dentition in not having one of the following type of teeth

  1. Canine

  2. Premolars

  3. Molars

  4. Incisors
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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.

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Find the odd out and state category of rest ;

  1. Thymine, Cytosine, Adenine, Pepsin

  2. Cortisone , Somatotropin, Adrenocorticotropic hormone, Vasopressin

  3. Cerebrum, Cerebellum, Thalamus, Hypothalamus

  4. Urea, Creatinine, Ammonia, Uric acid

  5. Neutrophils, Eosinophils, Basophils, Lymphocytes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(A)Pepsin is not a nitrogenous base.

(B)Cortisone, Somatotropin, Adrenocorticotropic, Vasopressin are all hormones.
(C)Cerebrum, Cerebellum, Thalamus, Hypothalamus are all parts of the brain.
(D)Urea, Creatinine, Ammonium, Uric acid are all nitrogen-based products.
(E)Neutrophils, Eosinophils, Basophils, Lymphocytes are all compounds of blood cells.
Thus, the correct answer is 'Thymine, Cytosine, Adenine, Pepsin.'

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The undigested, semisolid food is called 

  1. Anus

  2. Faeces

  3. Rectum

  4. Villi
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • 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.
Hence, The undigested, semisolid food is called faeces.
So, the correct answer is 'faeces'.
Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The longest part of the alimentary canal is 

  1. Oesophagus

  2. Large intestine

  3. Small intestine

  4. Stomach
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • 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.  
So, the correct answer is 'Small intestine'.

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Stomach secretes

  1. Dilute hydrochloric acid

  2. Dilute sulphuric acid

  3. Dilute citric acid

  4. Dilute nitric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • 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'
So, the correct answer is 'Dilute hydrochloric acid'.
Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

Bile is secreted by 

  1. Stomach

  2. Small intestine

  3. Pancreas

  4. Liver
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • 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.
So, the correct answer is 'liver'.

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The inner layer of the stomach releases

  1. Water

  2. Blood

  3. Minerals

  4. Digestive juices
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • 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.
So, the correct answer is 'digestive juices'.

Multiple choice evs digestion of food types of ecological pyramids the muscular system and digestive system in human beings introduction to human digestive system

The stomach takes part in

  1. Breaking food mechanically

  2. Partially digesting the food

  3. Disinfecting the food

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The stomach performs multiple functions: mechanical digestion through churning, partial chemical digestion of proteins, and disinfecting food using hydrochloric acid.