Biology · Science General

Human Digestive System

1,953 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

Brunners gland is found in

  1. mouth

  2. jejunum

  3. ileum

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

Brunner's gland. : any of the compound racemose glands in the submucous layer of the duodenum that secrete alkaline mucus and a potent proteolytic enzyme—called also duodenal gland.

Multiple choice

Salivary amylase works best at pH

  1. 6.9

  2. 7.5

  3. 2

  4. 7

  5. 14
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Salivary amylase is responsible for breaking starch into polypeptides. The enzyme works best at pH 6.9. At this level, it is slightly acidic in nature.

Multiple choice

Which of the following statements is incorrect?

  1. Serosa is the outermost layer of the alimentary canal and is made up of squamous epithelium.

  2. Submucosal layer is made up of loose connective tissues.

  3. Mucosa is made up of an outer circular muscle layer and an inner longitudinal muscle layer.

  4. Submucosa contains nerve cells called submucous plexus.

  5. The lamina propria is the middle layer of mucosa.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mucosa is the innermost layer of the wall of the alimentary canal which is devoid of circular and longitudinal muscles. Instead, it consists of glands responsible for the secretion of mucus and other enzymes.