CNC Digestive Health & Gut Nutrition 1 — Questions and Answers
Question 1: What is the primary site of nutrient absorption in the human digestive system?
- Large intestine
- Small intestine (Correct answer)
- Stomach
- Esophagus
Correct answer: Small intestine
The small intestine is the primary site of nutrient absorption, facilitated by villi and microvilli that greatly increase its surface area.
Question 2: Which organ is responsible for producing bile, which aids in the digestion of dietary fats?
- Pancreas
- Stomach
- Liver (Correct answer)
- Gallbladder
Correct answer: Liver
The liver produces bile, which is then stored in the gallbladder and released into the small intestine to emulsify dietary fats for digestion.
Question 3: What term describes live microorganisms that, when consumed in adequate amounts, confer a health benefit to the host?
- Prebiotics
- Probiotics (Correct answer)
- Synbiotics
- Postbiotics
Correct answer: Probiotics
Probiotics are defined as live microorganisms that provide health benefits to the host when consumed in sufficient quantities, as established by the WHO/FAO.
Question 4: Which type of dietary fiber selectively stimulates the growth and activity of beneficial bacteria in the colon?
- Insoluble fiber
- Resistant starch
- Prebiotic fiber (Correct answer)
- Cellulose
Correct answer: Prebiotic fiber
Prebiotic fiber (e.g., inulin, FOS) selectively feeds beneficial gut bacteria such as Bifidobacteria and Lactobacilli, supporting a healthy microbiome.
Question 5: Which enzyme, secreted by the stomach, begins the chemical digestion of proteins?
- Lipase
- Amylase
- Pepsin (Correct answer)
- Trypsin
Correct answer: Pepsin
Pepsin is a protease secreted as pepsinogen by gastric chief cells; it is activated by stomach acid and initiates protein digestion.
Question 6: The gut microbiome refers to the collective community of microorganisms inhabiting the gastrointestinal tract. Approximately how many microbial cells does it contain?
- Hundreds of thousands
- Tens of millions
- Hundreds of billions to trillions (Correct answer)
- A few thousand
Correct answer: Hundreds of billions to trillions
The human gut microbiome consists of hundreds of billions to trillions of microbial cells, representing thousands of species that influence digestion, immunity, and metabolism.
Question 7: Increased intestinal permeability, sometimes referred to as 'leaky gut,' is characterized by which of the following?
- Overproduction of digestive enzymes
- Compromised tight junctions allowing unintended molecules to pass into the bloodstream (Correct answer)
- Excessive mucus production in the colon
- Reduced bile acid secretion
Correct answer: Compromised tight junctions allowing unintended molecules to pass into the bloodstream
Leaky gut occurs when tight junctions between intestinal epithelial cells become compromised, allowing bacteria, toxins, and undigested particles to pass into the bloodstream.
CNC Digestive Health & Gut Nutrition 1
What is the primary site of nutrient absorption in the human digestive system?