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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Read the Digestion notesFree MDCAT chapter notes with key terms680 questions · page 22 of 34
- A. Arteries
- B. Arterioles
- C. Veins
- D. Capillaries
Explanation: Semilunar valves are present in veins to prevent back flow of blood.
Correct answer: Veins- A. Transport fat
- B. Provide immunity
- C. Blood filtralron
- D. Filtration of urea
Explanation: Transportation of absorbed lipids from small intestine, filtration of blood by spleen and immunity is related to the lymphatic system…
Correct answer: Filtration of urea- A. Lacteal
- B. Lymph node
- C. Left thoracic lymphatic duct
- D. Left subclavian vein
Explanation: Lymph is extra cellular fluid present in lymph vessels. Subclavian vein is a part of blood circulatory system.
Correct answer: Left subclavian vein- A. CSF
- B. InterstitiaI fluid
- C. Blood
- D. Urine
Explanation: The lymph is formed when the interstitiaI fluid (the fluid which lies in the interstices of body tissues) is collected through lymph…
Correct answer: InterstitiaI fluid- A. Thymus
- B. Spleen
- C. Adenoid
- D. Tonsils
Explanation: The largest lymphoid structure present in the human body is spleen while thymus, adenoid and tonsils are relatively small structures.
Correct answer: Spleen- A. Skeletal muscles
- B. Visceral movements
- C. Breathing movements
- D. All A, B, C
Explanation: Lymph flow from body parts is assisted by the movement of viscera, breathing movement and skeletal muscles.
Correct answer: All A, B, C- A. Spleen
- B. Lymph nodes
- C. Tonsils
- D. Liver
Explanation: Lymph nodes are important for the proper functioning of the immune system, acting as filters for foreign particles and cancer cells.
Correct answer: Lymph nodes- A. Heart
- B. Abdominal vesseles
- C. Groin lymph nodes
- D. Thoracic lymphatic duct
Explanation: The thoracic duct is the largest lymphatic vessel within the human body. Lymph before entering into the blood passes through lymphatic duct.
Correct answer: Thoracic lymphatic duct- A. Lymph nodes
- B. Venous valves
- C. Calf muscles
- D. Cytokines
Explanation: Lymph movement is controlled by the contraction of skeletal muscles. The calf muscles are skeletal muscles in lower limbs that will assist…
Correct answer: Calf muscles- A. 10%
- B. 1%
- C. 20%
- D. 8%
Explanation: After some fatty meal fat globules forms 1% of lymph that returns to blood.
Correct answer: 1%- A. Superior vena cava
- B. Interior vena cava
- C. Sub-clavian vein
- D. Renal vein
Explanation: The thoracic duct is the largest. lymphatic vessel within the human body. Lymph enters into left su -clavian vein through thoracic duct.
Correct answer: Sub-clavian vein- A. Recognition of antigen
- B. Tissue rejection
- C. Production of antibodies
- D. Plasma clone formation
Explanation: Recognition of antigen is important in both types of responses, However, tissue rejection is a cell mediated response, on the other hand…
Correct answer: Recognition of antigen- A. Artificial active immunity
- B. Natural active immunity
- C. Artificial passive immunity
- D. Natural passive immunity
Explanation: Artificially-acquired passive immunity is an immediate, but short-term immunization provided by the injection of antibodies, such as gamma…
Correct answer: Artificial active immunity- A. Artificial active immunity
- B. Natural active immunity
- C. Artificial passive immunity
- D. Natural passive immunity
Explanation: Passive immunity can occur naturally, when matemal antibodies are transferred to the fetus through the placenta and it can also be induced…
Correct answer: Artificial passive immunity- A. One Heavy chain only
- B. Two heavy chains only
- C. Two heavy and two light chains only
- D. Two light chains only
Explanation: Two light and two heavy chains are visible in given diagram.
Correct answer: Two heavy and two light chains only- A. Fibrous
- B. Globular
- C. Catalytic
- D. Regulatory
Explanation: An antibody (Ab), also known as an immunoglobulin (lg), is a large, Y-shaped globular protein produced mainly by plasma cells that is used…
Correct answer: Globular- A. Constant region of heavy chain only
- B. Constant region of light chain only
- C. Variable region of both heavy and light chains
- D. Constant region of both heavy and light chains
Explanation: As we can sec antigen binding sites are present on variable region of both heavy and light chains
Correct answer: Variable region of both heavy and light chains- A. Antigen
- B. lmmunoglobulin
- C. Antibodies
- D. Plasmogen
Explanation: An antigen is any substance that causes your immune system to produce antibodies against it.
Correct answer: Antigen- A. Recognize antigen
- B. Mobilize lymphocytes
- C. Increase antibodies production
- D. Mobilize hemoglobin
Explanation: These specialized cells and parts of the immune system offer the body protection against disease. This protection is called immunity.
Correct answer: Mobilize hemoglobin- A. All infections
- B. HIV infection
- C. All inflammations
- D. All diseases
Explanation: Human immunodeficiency virus (HIV) is an infection that attacks the body's immune system.
Correct answer: HIV infection