Biology · Science General

Human Digestive System

2,002 Questions

The human digestive system explores the breakdown of biomacromolecules, covering organs from the stomach to the small intestine. It involves physiological processes like chyme movement, pH levels, and nutrient absorption in the gut. These fundamental biology concepts are regularly featured in medical and general science competitive exams.

Small intestine functionsBiomacromolecule breakdownStomach and digestionIntestinal bacteria

Human Digestive System Questions

Multiple choice

Brunner's glands function in protecting duodenum from acidic chyme by secreting alkaline mucus rich in bicarbonate. Brunner's glands are located in the

  1. intestinal epithelium of duodenum

  2. muscularis externa of duodenum

  3. submucosa of duodenum

  4. lamina propria of duodenum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Brunner's glands are located in the submucosa of duodenum. Their  function is to protect duodenum from acidic chyme by secreting alkaline mucus rich in bicarbonate. They also secrete urogastrone, which inhibits chief cells and parietal cells from secreting HCL and other acidic enzymes.

Multiple choice

EGF (epidermal growth factor) is secreted by the sub-mandibular gland. It is biologically active in which of the following?

a. Healing of gastrointestinal ulcers b. Inhibition of gastric acid secretion c. Stimulation of DNA breakdown d. Activation of gastric enzymes

  1. Only a and b

  2. Only a, b and d

  3. Only b, c and d

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

EGF is produced by sub-mandibular gland and plays an important biological effect on salivary EGF, including the healing of oral and gastroesophageal ulcers and in the inhibition of gastric acid secretion.