Tag: digestion and absorption
Questions Related to digestion and absorption
Rennin acts on ______________________.
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Milk changing casein into calcium paracaseinate at 7.2 8.2 pH
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Proteins in stomach
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Fat in intestine
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Milk changing casein into calcium paracaseinate at 1 3 pH
Which pair reaches the stomach totally undigested?
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Fat, cellulose
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Starch, cellulose
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Protein, starch
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Starch, fat
Which gastric secretion is correctly matched with its source
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Pepsin Chief cells
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Chymotrypsin Parietal cells
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HCl Goblet cells
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Mucus Oxyntic cells
Semi-indispensible amino acids are
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Arginine and histidine
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Methionine and threonine
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Leucine and isoleucine
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Arginine and lysine
Three major types of cells in stomach are ________________.
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Mucous cells, chief cells, oxyntic cells
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Mucous cells, chief cells, enteroendocrine cells
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Mucous cells, enteroendocrine cells, oxyntic cells
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Enteroendocrine cells, chief cells, oxyntic cells
Gastric juice contains
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HCl and pepsin
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pepsin and trypsin
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trypsin and HCI
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amylopsin and pepsin
Gastric juice comprising a mixture of substances, including pepsin and hydrochloric acid, secreted by glands of the stomach. Its principal function is to break down proteins into polypeptides during digestion.
Enzyme pepsin in the gastric juice helps in the digestion of :-
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carbohydrates
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fats
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nucleic acids
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proteins
Pepsin is the chief digestive enzyme in the stomach that stomach that breaks down proteins. Cells produce pepsinogen that is produced to act on mucus by epithelial cells of the stomach that helps to protect the lining of the stomach from corrosive hydrochloric acid and pepsin.
In which of the following structures protein digestion first occurs?
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Mouth
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Stomach
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Large intestine
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Small intestine
- Digestion involves the mixing of food, its movement through the digestive tract, and the chemical breakdown of the large molecules of food into smaller molecules.
- Digestion begins in the mouth when we chew and swallow, and then it is passed on to the stomach where digestion takes place by gastric juices and enzymes secreted by the stomach and then it is passed to the small intestine where the digestion is completed.
- Pepsin is an enzyme which is released by zymogenic cells, the chief cells in the stomach and that degrades food proteins into peptides. Hence, the stomach is the structure where the protein digestion first occurs.
A digestive juice with a pH of approximately 2 is found inside the
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mouth
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stomach
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pancreatic duct
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small intestine
- The pH of your stomach varies, from 1-2 up to 4-5. When you eat, the stomach releases enzymes called proteases as well as hydrochloric acid to help in digestion.
- By itself, the acid doesn't really do much for digestion, but the proteases that cleave proteins work best in an acidic environment or low pH, so after a high-protein meal, your stomach pH may drop to as low as 1 or 2.
- However, buffers quickly raise the pH back to 3 or 4. After the meal has been digested, your stomach pH returns to a resting level of about 4 or 5. Hence, inside of the stomach, a digestive juice with a pH of approximately 2 is found.
Choose the correct answers from the alternatives given.
Which of the following enzymes has the lowest pH optimum?
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Pepsin
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Trypsin
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Salivary amylase
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Pancreatic amylase
- In humans and other mammals pepsin produced in the stomach by chief cells in an inactive form called pepsinogen.
- Once the pepsinogen is released into the stomach, the low pH from the gastric acid helps in the conversion of pepsinogen into pepsin, the active enzyme.
- Many proteins are denatured at low pH, and most enzymes whether or not they denature require a higher pH for activity. Hence, pepsin is the enzymes has the lowest pH optimum.