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
B
Correct answer
Explanation
Swallowed gum does NOT stay in intestines for 6 weeks. Like other indigestible materials (corn hulls, fiber), gum passes through the digestive system in 1-3 days, though digestion of the gum base itself is minimal.
B
Correct answer
Explanation
The human digestive system uses powerful enzymes and acids like pepsin and hydrochloric acid to break down proteins from any source, including pork, regardless of similarity to human tissue. The digestion process takes hours, not days or years.
A
Correct answer
Explanation
The stomach lining continuously produces mucus that protects it from its own digestive acids. The mucus layer is constantly renewed, though the exact timing varies in different sources.
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Spleen
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Liver
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Appendix
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Gall bladder
C
Correct answer
Explanation
The appendix has traditionally been considered a vestigial organ with no significant function in humans, though recent research suggests possible roles in maintaining gut flora. The other organs listed, spleen, liver, and gall bladder, all have well-established essential functions in digestion, immunity, and blood filtration.
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Inorganic
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Fibroids
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Dietary fiber
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Tumors
C
Correct answer
Explanation
Dietary fiber consists of plant-based carbohydrates that human digestive enzymes cannot break down. Unlike sugars, starches, and proteins that get digested and absorbed, fiber passes through the digestive system largely intact. This is actually beneficial: it adds bulk to stool, promotes regular bowel movements, and supports gut health. 'Inorganic' refers to minerals, not indigestible food components. 'Fibroids' are benign tumors (muscle tissue), not food components. 'Tumors' are abnormal tissue growths, unrelated to nutrition.
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Respiration
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Digestion
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Circulation
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Evaporation
B
Correct answer
Explanation
Gastric juice is produced by the stomach during the digestion process. This juice contains hydrochloric acid and digestive enzymes like pepsin that break down proteins and kill bacteria in food, making digestion the correct answer.
A
Correct answer
Explanation
The stomach does contain hydrochloric acid (HCl) which helps break down food and kills harmful bacteria and germs. This is a correct statement about human digestive system physiology.
A
Correct answer
Explanation
The primary function of the small intestine is absorption of nutrients from digested food. After food is broken down in the stomach, it enters the small intestine where the nutrients (carbohydrates, proteins, fats, vitamins, minerals) are absorbed into the bloodstream through millions of tiny projections called villi that increase surface area.
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Insulin
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Bile Juice
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Peptic Juice
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None of these
A
Correct answer
Explanation
The pancreas secretes insulin (from beta cells) and glucagon (from alpha cells) to regulate blood sugar. Bile juice is produced by the liver, and peptic juice contains digestive enzymes from the stomach. 'Peptic Juice' is not a standard biological term.
A
Correct answer
Explanation
Hepatic relates to the liver, coming from the Greek word 'hepar' meaning liver. Medical terms like 'hepatitis' (liver inflammation) and 'hepatology' (study of the liver) use the same root. The heart, brain, and kidney have their own prefixes: cardiac, cerebral, and renal.
B
Correct answer
Explanation
Honey requires digestion and absorption through the intestinal wall, which takes minutes to hours. The 20-second claim is physiologically impossible for substances to reach the bloodstream.
A
Correct answer
Explanation
While it appears tightly coiled in the abdominal cavity, the small intestine is remarkably long in adults. When fully stretched out, it typically measures around 20 to 22 feet.
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Insulin
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Bile Juice
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Peptic Juice
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None Of These
A
Correct answer
Explanation
The pancreas secretes insulin, a hormone essential for regulating blood glucose levels by enabling cells to absorb glucose from the bloodstream. Bile is produced by the liver, and peptic juice refers to gastric secretions from the stomach.
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Liver
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Stomach
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Small intestines
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Large intestines
C
Correct answer
Explanation
Most digestion and nutrient absorption occurs in the small intestine. The stomach primarily breaks down food with acid and enzymes. The liver produces bile, and large intestine absorbs water - neither is the primary digestion site.
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digestive material is available in honey
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digested by bees
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sterilized
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None of these
B
Correct answer
Explanation
Honey is easy to digest because bees have already partially broken down the complex sugars in nectar into simple sugars (glucose and fructose) through enzymes in their digestive systems. This pre-digestion process means our bodies don't have to work as hard to break it down. The other options are incorrect - honey isn't sterilized (it contains natural enzymes and pollen), and option A is circular reasoning.