Free Digestion MCQs with Answers
680 Digestion MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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- A. Cardiac sphincter
- B. Pylori sphincter
- C. Esophageal sphincter
- D. Colic sphincter
Explanation: Therefore, the most appropriate answer is A) Cardiac sphincter, as the inefficiency of the cardiac sphincter can lead to heartburn or…
Correct answer: Cardiac sphincter- A. Voluntary control
- B. Voluntary and involuntary control
- C. Involuntary control
- D. Involuntary and voluntary control
Explanation: Therefore, the correct answer is C) voluntary and involuntary control, as both mastication and peristalsis have elements of voluntary and…
Correct answer: Voluntary and involuntary control- A. Conversion of glucose into glycogen
- B. Deamination
- C. Conversion of glycogen into glucose
- D. All A,B,C
Explanation: Therefore, the correct answer is D) All A, B, C, as the liver performs all of these functions and more.
Correct answer: All A,B,C- A. Stimulate peristalsis
- B. Provide a large surface area of absorption
- C. Prevent antiperistalsis
- D. Distrute digestive enzymes uniformly
Explanation: Therefore, the correct answer is B) Provide a large surface area of absorption, as the main function of intestinal villi is to increase…
Correct answer: Provide a large surface area of absorption- A. Lipase
- B. Bile Pigments
- C. Salts
- D. Necessary enzymes
Explanation: Therefore, the correct answer is C) Salts, as bile contains bile salts that aid in the digestion and absorption of fats.
Correct answer: Salts- A. Trypsin
- B. Maltase
- C. Lipase
- D. Amino peptidase
Explanation: Therefore, the correct answer is D) Aminopeptidase, as it is the enzyme of the intestine that converts polypeptides into dipeptides.
Correct answer: Amino peptidase- A. Mucosa
- B. Muscularis
- C. Serosa
- D. Adventitia
Explanation: Therefore, the correct answer is A) Mucosa, as it is the innermost layer of the stomach.
Correct answer: Mucosa- A. Cartlage and muscles
- B. Skeletal muscle
- C. Muscles and bones
- D. Smooth muscle
Explanation: Therefore, the correct answer is B) Skeletal muscle, as the tongue is primarily made up of skeletal muscle tissue.
Correct answer: Skeletal muscle- A. Absorption of food
- B. Feces formation
- C. Storage
- D. Water absorption
Explanation: Therefore, the correct answer is A) Absorption of food, as the large intestine is not primarily responsible for the absorption of food.
Correct answer: Absorption of food- A. Abdominal muscles
- B. Biceps
- C. Skeletal muscle
- D. Diaphragm
Explanation: The diaphragm is a dome-shaped muscle located below the lungs that plays a crucial role in the process of ventilation, specifically in…
Correct answer: Diaphragm- A. 0.01% and 5.3%
- B. 0.04% and 4.0%
- C. 0.4% and 5.0%
- D. 0.04% and 5.0%
Explanation: The inspired air will have the global average concentration of CO2 which is 0.04%, whereas the expired air will have a higher…
Correct answer: 0.04% and 4.0%- A. Two thick edge cartilaginous
- B. Two thin edges fibrous
- C. Two thin edge muscular
- D. Two pairs of thick edge fibrous
Explanation: The vocal cords are composed of two thin edges made of fibrous tissue. These fibrous edges vibrate when air passes through them, producing…
Correct answer: Two thin edges fibrous- A. Nasal cavities
- B. Bronchi
- C. Trachea
- D. Alveoli
Explanation: The air is warmed as it passes through the nasal cavity. The nasal cavity is lined with membranes, which help to warm the air.
Correct answer: Nasal cavities- A. Esophageal sphineter
- B. Epiglottis
- C. Respiratory Valve
- D. Soft palate
Explanation: The epiglottis is a flap of tissue located at the base of the tongue, and its main function is to prevent food and liquids from entering…
Correct answer: Epiglottis- A. Positive
- B. No effect
- C. Negative
- D. First negative then positive
Explanation: When the solution is at a lower pH, hemoglobin tends to release more oxygen because it doesn't have as much affinity to keep the oxygen…
Correct answer: Negative- A. Alveolar duct
- B. Alveolar sacs
- C. Alveoli
- D. All A,B,C
Explanation: Cartilage is only present in the upper respiratory tract. Terminal bronchiole, respiratory bronchiole, alveolar duct and alveoli do not…
Correct answer: All A,B,C- A. Trachea
- B. Bronchi
- C. Bronchioles
- D. Alveoli
Explanation: The alveoli are the smallest air sacs in the lungs. They are surrounded by a network of capillaries, and they are where gas exchange takes…
Correct answer: Alveoli- A. Columnar epithelium
- B. Squamous epithelium
- C. Ciliated epithelium
- D. Cuboidal epithelium
Explanation: The nasal cavity is lined with a specialized type of epithelium called the respiratory epithelium, which consists of ciliated epithelial…
Correct answer: Ciliated epithelium- A. Can bind with four O2 molecules
- B. Single Heme group
- C. Composed of one polypeptid chain
- D. Iron is present
Explanation: Each myoglobin molecule is capable of binding to one oxygen, because myoglobin contains one heme per molecule.
Correct answer: Can bind with four O2 molecules- A. Single-layer
- B. Triple-layer
- C. Double-layer
- D. Pair of double layers
Explanation: The pleura consists of two layers: the visceral pleura, which is the inner layer that directly covers the lung surface, and the parietal…
Correct answer: Double-layer