Digestion and Absorption MCQs

Read the statements regarding fat digestion and select the correct option:

I. Lipases are secreted by gastric glands, pancreas, and intestinal mucosa.
II. Gastric glands secrete small amounts of lipases.
III. Pancreatic lipase is the major enzyme that breaks fats into diglycerides and monoglycerides.
IV. Intestinal lipases convert glycerides into fatty acids and glycerol.

Which of the following statements about the digestion of nucleic acids is/are correct?

I. Nucleases present in the pancreatic juice convert DNA and RNA into nucleotides and nucleosides.
II. Intestinal nucleotidases convert nucleotides into nucleosides.
III. Intestinal nucleosidases convert nucleosides into nitrogenous bases and pentose sugars.
IV. Nucleic acid digestion starts in the mouth due to salivary nucleases.

Read the following statements about the human large intestine and select the correct set:

I. It consists of the caecum, colon, and rectum.
II. No significant chemical digestive activity occurs here.
III. Its primary functions are the absorption of some water, minerals, and certain drugs.
IV. Mucus secreted by the large intestine helps in lubricating and adhering waste particles.

Assess the statements regarding the neural regulation of human gastrointestinal activities:

I. The sight, smell, or presence of food in the oral cavity can stimulate salivary secretion.
II. Gastric and intestinal secretions are stimulated by neural signals.
III. The muscular activities of the gut wall can be moderated by both local and CNS neural mechanisms.
IV. Neural control is restricted to salivary secretion, while all other secretions are strictly hormonal.

Read the following statements regarding the hormonal regulation of digestive secretions:

I. Hormonal control of the secretion of digestive juices is carried out by local hormones.
II. These local hormones are produced by the gastric and intestinal mucosa.
III. Gastrin, secretin, and cholecystokinin are examples of these local regulatory hormones.
IV. These hormones are secreted directly into the lumen of the alimentary canal to mix with food.

Identify the correct set of statements regarding the transport mechanisms of absorption across the intestinal mucosa:

I. Small amounts of glucose, amino acids, and chloride ions are generally absorbed by simple diffusion.
II. Facilitated transport of glucose and amino acids involves carrier proteins.
III. Active transport of glucose, amino acids, and sodium ions (Na⁺) occurs against a concentration gradient.
IV. The absorption of water across the mucosal epithelium depends upon the osmotic gradient.

With respect to fat absorption in the human small intestine, evaluate the following statements:

I. Fatty acids and glycerol are water-insoluble and cannot be absorbed directly into the blood.
II. Micelles are small water-soluble droplets formed in the lumen that carry lipids into the mucosal cells.
III. Inside the mucosal cells, lipids are re-formed into protein-coated fat globules called chylomicrons.
IV. Chylomicrons are transported from mucosal cells directly into blood capillaries.

Read the following statements summarizing absorption in different parts of the human alimentary canal and choose the correct set:

I. Certain drugs coming in contact with the mouth mucosa under the tongue are absorbed into capillaries.
II. Absorption of water, simple sugars, and alcohol takes place in the stomach.
III. The small intestine is the principal organ for nutrient absorption where digestion is completed.
IV. The large intestine absorbs water, some minerals, and certain drugs.

Assess the correctness of the following statements regarding infections of the human gastrointestinal tract:

I. Inflammation of the intestinal tract is the most common ailment of the digestive system.
II. Intestinal inflammation is caused exclusively by bacterial infections.
III. Parasites of the intestine include tapeworm, roundworm, threadworm, hookworm, and pinworm.
IV. Intestinal infections are primarily caused by viral or bacterial pathogens.

Which of the following statements regarding digestive disorders is/are correct?

I. In Jaundice, the liver is affected and skin and eyes turn yellow due to the deposition of bile pigments.
II. Vomiting is a reflex action controlled by a centre in the cerebrum and is preceded by a feeling of nausea.
III. Diarrhoea involves increased liquidity of faecal discharge and reduced food absorption.
IV. Constipation is characterized by the irregular retention of faeces within the rectum.