Tag: digestive system of human

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Questions Related to digestive system of human

Multiple choice bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

Calcium absorption is always enhanced by the action of the following vitamin

  1. Vitamin A

  2. Vitamin B

  3. Vitamin D

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

Vitamin D helps in the absorption of calcium ion from the walls of the duodenum to the bloodstream and also maintains its level in the body.

So the correct option is 'Vitamin D'.

Multiple choice bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

Which of the following is true regarding the absorption mechanism of carbohydrates in the intestine?

  1. Glucose is absorbed passively

  2. Galactose is absorbed passively

  3. Fructose is transported actively

  4. Glucose and galactose are transported actively
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Glucose and galactose transport against the concentration and hence require energy and carrier which transport them from lumen of the intestine to cell and are co transported with sodium ion.

So the correct option is 'Glucose and galactose are transported actively'

Multiple choice bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

What percentage of amino acids is absorbed in the small intestine?

  1. 15%

  2. 30%

  3. 100%

  4. 90-95%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initiation of protein digestion starts in the stomach by pepsin but around 90-95% of protein is digested and absorbed in duodenum and jejunum of the small intestine in the form of amino acids by the action of enzymes trypsin, chymotrypsin and carboxypeptidases.

So the correct option is '90-95%'

Multiple choice bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

Which of the following substances are not absorbed into the lymphatic system?

  1. Fatty acids

  2. Glycerol

  3. Fat soluble vitamins

  4. Water soluble vitamins
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water-soluble vitamins are directly absorbed into the intestine and transported to water as they do not require any emulsification because water is free to move in and out but fat soluble liquids absorb into lymph due to their insolubility in water and they need to emulsify before absorption.

So the correct option is 'Water-soluble vitamins'

Multiple choice bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

$30\%$ starch is hydrolysed in Buccal cavity by which of the following enzymes?

  1. Pancreatic $\alpha$ -amylase

  2. Lipase

  3. Maltase

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

Salivary glands in your mouth (Buccal cavity) make salivary amylase, which begins the digestive process by breaking down starch when you chew your food, converting it into maltose, a smaller carbohydrate.

So the correct option is D, salivary amylase.

Multiple choice bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

In jejunum, enzyme required for digestion of amino acid containing compounds is

  1. Trypsin

  2. Pepsin

  3. Peptidase

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

Peptidases are enzymes responsible for breaking down peptides into amino acids within the small intestine, including the jejunum. Trypsin and chymotrypsin are pancreatic proteases, while pepsin is a gastric enzyme.

Multiple choice bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

Digestion of carbohydrates occurs in

  1. Buccal cavity

  2. Stomach

  3. Intestine

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

Carbohydrate digestion begins in the buccal cavity with salivary amylase, continues in the intestine with pancreatic amylase, and involves various enzymes in the stomach lining or intestinal brush border. Therefore, all listed sites are involved in the process.

Multiple choice bio-chemistry digestive system of human absorption of food absorption parts of the digestive system: structure and function

Which is true about digestion and absorption of food?

  1. 60% starch is hydrolysed by salivary amylase

  2. Oxyntic cells secrete pepsinogen

  3. Chylomicrons are small lipoprotein particles passed in intestine into blood capillaries
  4. Fructose and amino acids area absorbed in intestine with the help of carrier ions of $Na^+$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fructose and amino acids are absorbed in the small intestine via facilitated diffusion or secondary active transport, often coupled with Na+ ions. Option A is incorrect as salivary amylase hydrolyzes only about 30% of starch, and option B is incorrect because oxyntic cells secrete HCl.