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Digestion

মোট প্রশ্ন২১এই পাতা২১প্রতি পাতা১০০
ঘনত্ব
উত্তর
উত্তরিতবর্তমানপুনরায় দেখুনঅসম্পূর্ণ

Digestion

PrepBank · পাতা / · ২১ / ২১

.
Digestion of proteins starts in
  1. Mouth
  2. Stomach
  3. Small intestine
  4. Large intestine
সঠিক উত্তর:
Stomach
উত্তর
সঠিক উত্তর:
Stomach
ব্যাখ্যা
Digestion of proteins does not occur in mouth, since saliva does not contain any proteolytic enzymes. So, the digestion of proteins starts only in stomach
.
Ptyalin is required in digestion of
  1. Carbohydrate
  2. Protein
  3. Lipid
  4. Minerals
সঠিক উত্তর:
Carbohydrate
উত্তর
সঠিক উত্তর:
Carbohydrate
.
Stimuli that inhibit gastrin secretion
  1. ক) Somatostatin
  2. খ) Distention
  3. গ) Increased vagal discharge
  4. ঘ) Calcium
সঠিক উত্তর:
ক) Somatostatin
উত্তর
সঠিক উত্তর:
ক) Somatostatin
ব্যাখ্যা
Somatostatin inhibits gastrin secretion.
.
Accessory digestive organs exclude
  1. ক) Teeth
  2. খ) Tongue
  3. গ) Pharynx
  4. ঘ) Salivary glands
সঠিক উত্তর:
গ) Pharynx
উত্তর
সঠিক উত্তর:
গ) Pharynx
ব্যাখ্যা

Accessory digestive organs are those which help primary digestive organs in the process of digestion. Accessory digestive organs are:
• Teeth
• Tongue
• Salivary glands
• Exocrine part of pancreas
• Liver
• Gallbladder

.
Which one is acidic?
  1. Gastric secretion
  2. Succcus entericus
  3. Liver bile
  4. Gallbladder bile
সঠিক উত্তর:
Gastric secretion
উত্তর
সঠিক উত্তর:
Gastric secretion
.
Substance that increase salivary secretion
  1. ক) Histamine
  2. খ) Ergotamine
  3. গ) Atropine
  4. ঘ) Chloroform
সঠিক উত্তর:
ক) Histamine
উত্তর
সঠিক উত্তর:
ক) Histamine
ব্যাখ্যা

Substances which increase salivary secretion
• Sympathomimetic drugs like adrenaline and ephedrine.
• Parasympathomimetic drugs like acetylcholine, pilocarpine, muscarine and physostigmine.
• Histamine.

Substances which decrease salivary secretion
• Sympathetic depressants like ergotamine and dibenamine.
• Parasympathetic depressants like atropine and scopolamine.
• Anesthetics such as chloroform and ether stimulate the secretion of saliva. However, deep anesthesia decreases the secretion due to central inhibition.

.
Increased vagal tone tends to increase
  1. ক) Heart rate
  2. খ) Decreased peristalsis
  3. গ) Diameter of blood vessel
  4. ঘ) Secretion of HCl
সঠিক উত্তর:
ঘ) Secretion of HCl
উত্তর
সঠিক উত্তর:
ঘ) Secretion of HCl
ব্যাখ্যা

Effects of increased vagal tone
On CVS -
-Negative inotropism
-Negative chronotropism
-Decreases excitability
-Decreases conductivity
On GIT-
-increased secretion of GIT
-increased motility of GIT

.
HCL is secreted from-
  1. ক) Chief cell
  2. খ) Oxyntic cell
  3. গ) G-cell
  4. ঘ) Mucus neck cell
সঠিক উত্তর:
খ) Oxyntic cell
উত্তর
সঠিক উত্তর:
খ) Oxyntic cell
ব্যাখ্যা
HCl is secreted from parietal/oxyntic cell of stomach.
.
Secretin matches with
  1. It allows gastric emptying to delay the acid contents of stomach to enter in the duodenum
  2. It inhibits gastric secretion.
  3. It acts on pancreatic duct to produce large volume of copious secretion
  4. Secretin is released from large intestine
সঠিক উত্তর:
It inhibits gastric secretion.
উত্তর
সঠিক উত্তর:
It inhibits gastric secretion.
ব্যাখ্যা
Secretin is released from small intestine when stomach acid contents come to duodenum.
Functions:
• It inhibits gastric emptying to delay the acid contents of stomach to enter in the duodenum.
• It inhibits gastric secretion.
• It acts on pancreatic duct to produce large volume of watery, NaHCO3 secretion.
• It stimulates the secretion of NaHCO3 rich bile in the liver by acting on the bile ducts.
১০.
Which of the following is the site of secretion of intrinsic factor?
  1. Gastric antrum
  2. Gastric fundus
  3. Duodenum
  4. Ileum
সঠিক উত্তর:
Gastric fundus
উত্তর
সঠিক উত্তর:
Gastric fundus
ব্যাখ্যা
Intrinsic factor is secreted by the parietal cells of the gastric fundus (as is HCl). It is absorbed, with vitamin B12, in the ileum.
১১.
Activator of salivary α-amylase
  1. ক) H+
  2. খ) K+
  3. গ) Cl-
  4. ঘ) Na+
সঠিক উত্তর:
গ) Cl-
উত্তর
সঠিক উত্তর:
গ) Cl-
ব্যাখ্যা
Cl- activates salivary alpha amylase.
১২.
In infants, defecation often follows a meal. The cause of colonic contractions in this situation is -?
  1. ক) Increased circulating levels of CCK.
  2. খ) The gastrocolic reflex.
  3. গ) Increased circulating levels of somatostatin.
  4. ঘ) The enterogastric reflex.
সঠিক উত্তর:
খ) The gastrocolic reflex.
উত্তর
সঠিক উত্তর:
খ) The gastrocolic reflex.
ব্যাখ্যা
Explanation- Distension of the stomach by food initiates contractions of the rectum and, frequently, a desire to defecate. The response is called the gastrocolic reflex, and may be amplified by an action of gastrin on the colon. Because of the response, defecation after meals is frequent in children. In adults, habit and cultural factors play a large role in determining when defecation occurs.
Reference-Ganong physiology/26th/P-494
১৩.
Factor stimulating the Secretion of Hydrochloric Acid
  1. Gastrin
  2. Secretin
  3. Gastric inhibitory polypeptide
  4. Peptide YY
সঠিক উত্তর:
Gastrin
উত্তর
সঠিক উত্তর:
Gastrin
ব্যাখ্যা

Factors Stimulating the Secretion of Hydrochloric Acid
• Gastrin
• Histamine
• Vagal stimulation

Factors Inhibiting the Secretion of Hydrochloric Acid
• Secretin
• Gastric inhibitory polypeptide
• Peptide YY

১৪.
Digestion of proteins does not occur in
  1. ক) Mouth
  2. খ) Stomach
  3. গ) Small intestine
  4. ঘ) Large intestine
সঠিক উত্তর:
ক) Mouth
উত্তর
সঠিক উত্তর:
ক) Mouth
ব্যাখ্যা
Digestion of proteins does not occur in mouth, since saliva does not contain any proteolytic enzymes. So, the digestion of proteins starts only in stomach.
১৫.
Secretion of which of the following substances is inhibited by low pH?
  1. Secretin
  2. Gastrin
  3. Cholecystokinin (CCK)
  4. Vasoactive intestinal peptide (VIP)
সঠিক উত্তর:
Gastrin
উত্তর
সঠিক উত্তর:
Gastrin
ব্যাখ্যা
Gastrin’s principal physiologic action is to increase H+ secretion. H+ secretion decreases the pH of the stomach contents. The decreased pH, in turn, inhibits further secretion of gastrin—a classic example of negative feedback.
১৬.
Activator of pepsinogens
  1. ক) H+
  2. খ) K+
  3. গ) HCl
  4. ঘ) Na+
সঠিক উত্তর:
গ) HCl
উত্তর
সঠিক উত্তর:
গ) HCl
ব্যাখ্যা
HCl activates pepsinogen to active pepsin.
১৭.
Composition of normal human pancreatic juice
  1. Ca2+
  2. Mg2
  3. pH approximately 8.0
  4. All
সঠিক উত্তর:
All
উত্তর
সঠিক উত্তর:
All
ব্যাখ্যা
Composition of normal human pancreatic juice.
Cations: Na+, K+, Ca2+, Mg2+ (pH approximately 8.0)
Anions: HCO3-, Cl-, SO42-, HPO42-
Digestive enzymes -95% of protein in juice)
Other proteins
১৮.
Stimuli that increase gastrin secretion
  1. Somatostatin
  2. Epinephrine
  3. glucagon
  4. Secretin
সঠিক উত্তর:
Epinephrine
উত্তর
সঠিক উত্তর:
Epinephrine
১৯.
Which one may be acidic?
  1. ক) Saliva
  2. খ) Succus entericus
  3. গ) Liver bile
  4. ঘ) Gallbladder bile
সঠিক উত্তর:
ক) Saliva
উত্তর
সঠিক উত্তর:
ক) Saliva
২০.
Which of the following has the highest pH?
  1. ক) Gastric juice
  2. খ) Colonic luminal contents
  3. গ) Pancreatic juice
  4. ঘ) Contents of the intestinal crypts
সঠিক উত্তর:
গ) Pancreatic juice
উত্তর
সঠিক উত্তর:
গ) Pancreatic juice
ব্যাখ্যা
Explanation- pH of pancreatic juice is approximately 8.0.
Reference-Ganong physiology/26th/P-454/T-25.3
২১.
When hunger contractions occur in the stomach, the person sometimes experiences mild pain in the pit of the stomach, called
  1. ক) Hunger pangs
  2. খ) Acute gastritis
  3. গ) Ileus
  4. ঘ) Hunger contractions
সঠিক উত্তর:
ক) Hunger pangs
উত্তর
সঠিক উত্তর:
ক) Hunger pangs
ব্যাখ্যা
When hunger contractions occur in the stomach, the person sometimes experiences mild pain in the pit of the stomach, called hunger pangs.