Free Circulation MCQs with Answers
695 Circulation 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 circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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Read the Circulation notesFree MDCAT chapter notes with key terms695 questions · page 19 of 35
- A. Tissue Grafting
- B. Phagocytosis
- C. Cell Mediated Immunity / Response
- D. Hormonal Immunity / Response
Explanation: In cell-mediated immunity, antibodies are not involved, rather T-cells or macrophages recognize the antigen and destroy it.
Correct answer: Cell Mediated Immunity / Response- A. 4 months
- B. 2 months
- C. 5 months
- D. 1 month
Explanation: The average lifespan of a Red Blood Cell lasts 110-120 days, when they are destroyed by macrophages.
Correct answer: 4 months- A. Abdominal vein
- B. Jugular vein
- C. Sub-clavian vein
- D. Bile duct
Explanation: The thoracic duct is the largest lymphatic vessel within the human body. Lymph enters into left subelavain vein through thoracic duct.
Correct answer: Sub-clavian vein- A. Antigens
- B. Immunogens
- C. Serum
- D. Immunoglobulins
- E. C and d
Explanation: Immunoglobulins, also known as antibodies, are injected for passive immunity.
Correct answer: Immunoglobulins- A. Heavy part
- B. Variable part
- C. Light part
- D. Constant part
Explanation: The variable regions of an antibody are responsible for antigen recognition and binding.
Correct answer: Variable part- A. Disulphide bridges
- B. Peptide bond
- C. Glycerol bond
- D. Ionic bond
Explanation: Disulphide bonds can be used to hold different sub-units of protein complexes together, as is found in antibodies between the light chains…
Correct answer: Disulphide bridges- A. Lymphocytes
- B. Basophils
- C. Phagocytes
- D. Neutrophills
Explanation: Antibodies are primarily produced by lymphocytes, specifically B-cells, in response to invading cells or antigens.
Correct answer: Lymphocytes368. In the structural diagram of an antibody molecule which portion is occupied by variable chains?
- A. Lower region
- B. Upper region
- C. Middle region
- D. In between chains
Explanation: The variable chains of an antibody molecule, both the variable heavy chain and the variable light chains, occupy the upper region of the…
Correct answer: Upper region- A. Neutrophils
- B. Basophils
- C. Monocytes
- D. Both Neutrophils and Basophils
Explanation: Lymphocytes and monocytes are the two types of agranulocytes or nongranular leukocytes.These white blood cells have no obvious granules.
Correct answer: Monocytes- A. 1
- B. 2
- C. 3
- D. 4
- E. 5
Explanation: Antibody consists of two heavy chains and two light chains and two disulphide bridges are present between two heavy chains and two are…
Correct answer: 5- A. Passive immunity
- B. Active immunity
- C. Artificial active immunity
- D. Passive active immunity
Explanation: Passive immunity refers to short-term immunity which results from the introduction of antibodies from another person or animal.
Correct answer: Artificial active immunity- A. 1
- B. 2
- C. 3
- D. 4
Explanation: Antibody (or immunoglobulin) molecules are glycoproteins composed of one or more units; each containing four polypeptide chains; two…
Correct answer: 4373. In case of snake bite venom, passive immunity is produced by antitoxins, so the serum is called as:
- A. Antivenom serum
- B. Antiserum
- C. Passive immunity serum
- D. Anti snake serum
Explanation: In case of snake bites, the injection which is given to the patients, contains preformed antibodies against snake venom.
Correct answer: Antivenom serum- A. Right auricle
- B. Right ventricle
- C. Left auricle
- D. Left ventricle
Explanation: The first successful surgery of the heart was performed by Dr. Ludwig by repairing a wound on the Right ventricle.
Correct answer: Right ventricle- A. Secondary cell wall
- B. Middle lamella
- C. Primary cell wall
- D. Both "B" and "C"
Explanation: The primary cell wall of the plant is composed of cellulose, pectic compounds mostly polysaccharides, and hemicellulose. It lacks lignin.
Correct answer: Both "B" and "C"- A. Merozoite
- B. Ookinetes
- C. Trophozoites
- D. Gametozoites
Explanation: The stage of the plasmodium life cycle not related to the human body is Gametozoite. This can be explained below diagram.
Correct answer: Gametozoites- A. Antibodies
- B. Histamines
- C. Antigens
- D. Interferons
Explanation: Interferons are a group of natural proteins that are produced by human cells, they can interfere with viruses that are replicating.
Correct answer: Interferons- A. Sebum
- B. Perspiration
- C. Interferon
- D. Epidermis
Explanation: The first line of defense is formed by external barriers, such as skin and mucous membranes.
Correct answer: Interferon- A. Atrial systole
- B. Arial diastole
- C. Ventricle systole
- D. Ventricle diastole
Explanation: The second part of ECG is the QRS complex which features a small drop in voltage (Q) a large voltage peak ( R ) and another small drop in…
Correct answer: Ventricle systole- A. Potassium
- B. Sodium
- C. Magnesium
- D. Iron
Explanation: Haemoglobin consists of four polypeptide chains. Each chain is associated with a haem group.
Correct answer: Iron