Pepsin is secreted as inactive pepsinogen. Pepsinogen is converted into pepsin by hydrochloric acid. Optimum pH for activation of pepsinogen is below 6.
৪.
Secretion from which part of GIT lacks digestive enzyme
ক
Mouth
খ
Stomach
গ
Small intestine
ঘ
Large intestine
৫.
Large intestine secretion is devoid of
ক
ক) Water
খ
খ) Organic substance
গ
গ) Inorganic substances
ঘ
ঘ) Digestive enzymes
৬.
Co factor of carboxy peptidase
ক
Cu
খ
Mg
গ
Iron
ঘ
Zn
৭.
Source of Pepsinogen
ক
Chief cell
খ
Parietal cell
গ
G cell
ঘ
EC cell
ব্যাখ্যা
Pepsinogen is synthesized from amino acids in the ribosomes attached to endoplasmic reticulum in chief cells. Pepsinogen molecules are packed into zymogen granules by Golgi apparatus. When zymogen granule is secreted into stomach from chief cells, the granule is dissolved and Pepsinogen is released into gastric juice. Pepsinogen is activated into pepsin by hydrochloric acid.