Important facts of digestive system:
1.Hardest substance of our body--Enamel
2.Largest gland in our body=Liver(1.2-1.5kg)
in human adult.
3.Dental formula in human adult:2123/2123
4.Skin is the largest organ in body.
5.Secretion of gastric juice is stopped by--enterogastrone.
6.PH of HCL is 1.8
7.Salivary amylase (PH 6.8)
8.CHYME:
The food mixes throughly with the acidic gastric juice of the stomach by the churning movements of its muscular wall.
9.The stomach stores the food for 4-5 hours.
10.Pharynx which is serve as a common passage for food and air.
11.' J ' shaped bag like structure called stomach.
12. 'C' shaped : duodenum
SOME IMPORTANT MCQs with Answer:
Q.1-The layer of cells that secrete enamel of tooth is
(a) Osteoblast
(b) odonntoblast
(c) dentoblast
(d) ameloblast
Ans.(D)
Q.2-where is protein digestion accomplished
(a) stomach
(b) ileum
(c) rectum
(d) duodenum
Ans.(B)
Q.3-In man the zymogen or chief cells are mainly found in
(a) cardiac part of stomach
(b) pyloric part of stomach
(C) duodenum
(d)fundic part of stomach
Ans.(D)
Q.4-Which one of the following pairs of food components in humans reaches the stomach totally undigested?
(a) Starch and fat
(b)Fat and cellulose
(c) Starch and cellulose
(d) Protein and starch
Ans.(B)
Q.5-In the stomach gastric acid is secreted by the
(a) peptic cells
(b) acidic cells
(C) gastrin secreting cells
(d) parietal cells
Ans.(D)
Q.6-Gastric juice of infants contains
(a) pepsinogen,lipase,rennin.
(b) amylase,rennin,pepsinogen.
(c) maltase, pepsinogen,rennin
(d) nuclease,pepsinogen,lipase.
Ans.(A)
Q.7-The initial step in the digestion of milk in humans is carried out by
(a) lipase
(b) trypsin
(c) rennin
(d) Pepsin
Ans.(C)
Q.8-Anxiety and eating spicy food together in an otherwise normal human,may lead
(a) Jaundice
(b) diarrhoea
(c) Vomiting
(d) indigestion
Ans.(D)
Q.9.Jaundice is a disorder of
(a) digestive system
(b) excretory system
(c) skin and eyes
(d) circulatory system
Ans.(A)
Q.10- Hydrolytic enzymes which act on low pH are called as
(a) proteases
(b) hydrolases
(c) alfa-amylase
(d) peroxidases
Ans.(A)
Q.11-Secretin and cholecystokinin are digestive hormones.They are secreted in
(a) pyloric stomach
(b) ileum
(c) duodenum
(d) oesophagous
Ans.(C)
Q.12-In mammals milk is digested by the action of
(a) amylase
(b) rennin
(c) invertase
(d) intestinal bacteria
Ans.(B)
Q.13-The primary dentition in human differs from permanent dentition is not having one of the following type of teeth.
(a)Molars
(b)canines
(c) premolars
(d) incisors
Ans.(C)
Q.14-Which of the following carries glucose from digestive tract to liver?
(a) Hepatic portal vein
(b) pulmonary vein
(c) Hepatic artery
(d) none of these
Ans.(A)
Q.15- Secretin and cholecystokinin are digestive hormones. They are secreted in
(a)ileum
(b) pyloric stomach
(c) duodenum
(d) oesophagus
Ans(C)
Q.16- Emulsification of fat is carried out by
(a) bile pigments
(b)HCL
(c) bile salts
(d) pancreatic juice
Ans.(C)
Q.17- Kupffer's cells occur in
(a) Liver
(b)kidney
(c) brain
(d) spleen
Ans.(A)
Q.18- In vertebrates,lacteals are found in
(a) oesophagus
(b) ileum
(c) ear
(d) ischium
Ans.(B)
Q.19- Fructose is absorbed into the blood through the mucosa cells of intestine by the process called
(a) Active transport
(b) simple diffusion
(c)Facilitated diffusion
(d) co-transport mechanism.
Ans.(C)
Q.20-Which cells of Crypts of Lieberkuhn secrete antibacterial lysozyme?
(a) paneth cells
(b) Kupffer cells
(c) zymogen cells
(d) argentaffin cells
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