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 30 of 35
- A. Capillaries
- B. Veins
- C. Venae cavae
- D. Arteries
Explanation: As blood is directly pumped into aorta. Arteries are the vessels that carry blood away from the heart.
Correct answer: Arteries- A. Veins
- B. Arteries
- C. Capillaries
- D. Veins and capillaries
Explanation: Blood is not directly being pumped into veins and capillaries so they don't exhibit pulse pressure.
Correct answer: Veins and capillaries- A. Arteries
- B. Capillaries
- C. Arteries and capillaries
- D. Veins
Explanation: The pumping pressure of heart does not allows blood to move backward in these two types of vessels.
Correct answer: Arteries and capillaries- A. 75%
- B. 65%
- C. 35%
- D. 25%
Explanation: The role of globulins in the maintenance of the osmotic pressure of blood is 25%.
Correct answer: 25%- A. 120 days
- B. 30 days
- C. 60 days
- D. 90 days
Explanation: Normal human red blood cells have an average life span of 120 days in the circulation after which they are engulfed by macrophages.
Correct answer: 120 days- A. Acylglycerol
- B. Cholesterol
- C. Animal fat
- D. Edible oil
Explanation: Excess of cholesterol cause some cardiovascular problems however, a fixed amount of cholesterol is inevitable for animals including human…
Correct answer: Cholesterol- A. Neutrophils
- B. Eosinophils
- C. Monocytes
- D. Lymphocytes
Explanation: Monocytes carry out macrophagocytosis (destruction of larger foreign particles) however, neutrophils carry out microphagocytosis…
Correct answer: Monocytes- A. RBCs
- B. WBCs
- C. Platelets
- D. Erythrocytes
Explanation: Platelets are not cells, but are fragments of large cells called megakaryoctyes. There is no nucleus in them. There is no pigment in them.
Correct answer: Platelets- A. Thrombus
- B. Thrombosis
- C. Embolus
- D. Atheroma
Explanation: Thrombus usually occurs in a broken vessel, and so for temporary fixation, the brain sends signals to clotted blood at the site of injury…
Correct answer: Thrombus590. In thromboembolism:
- A. Thrombosis is followed by embolism
- B. Thrombosis follows the embolism
- C. Thrombosis and embolism occur simultaneously
- D. Thrombosis occurs independent of embolism
Explanation: First thrombosis occurs and then thrombus is dislodged and is trapped at new site.
Correct answer: Thrombosis is followed by embolism- A. Cerebral infraction
- B. Heart attack
- C. Myocardial infarction
- D. Both B and C
Explanation: Blockage of blood vessels in the heart by an embolus or a thrombus causes damage to a portion of heart muscles.
Correct answer: Both B and C- A. Paralysis
- B. Stroke
- C. Heart attack
- D. Hemorrhage
Explanation: Cerebral infarction results in sudden death so that is why it is called stroke.
Correct answer: Stroke- A. Deplasmolysis
- B. Ascent of sap
- C. Plasmolysis
- D. None of these
Explanation: Evaporation of water from aerial parts of plants is called transpiration. It is not given in the options.
Correct answer: None of these- A. Phagocytes
- B. Lymphocytes
- C. Monocytes
- D. Leukocytes
Explanation: Antibodies tag the foreign cells and help phagocytes identify and destroy them.
Correct answer: Phagocytes- A. Cell-mediated immune response
- B. Hormonal immune response
- C. Physiological immune response
- D. Autoimmune response
Explanation: Transplantation of tissue/organ often fails due to nonacceptance by the patient's body therefore, tissue matching and blood group matching…
Correct answer: Cell-mediated immune response- A. Gamma globulin
- B. Attenuated pathogens
- C. Activated pathogens
- D. Harvested antibodies
Explanation: The oral polio vaccine (OPV) is administered in the form of polio drops and typically contains weakened, live poliovirus strains.
Correct answer: Attenuated pathogens- A. 20%
- B. 70%
- C. 10%
- D. 50%
Explanation: Mucosa-associated lymphoid Tissue (MALT) are significant aggregation of lymphoid tissues that are seen in relation to the mucosa of the…
Correct answer: 50%- A. Lacteals
- B. Duodenum
- C. Villi
- D. Liver
Explanation: Lactease are present in villi to absorb and transport fats to the blood in the form of lipoprotein.
Correct answer: Lacteals- A. CO with organic portion of haem
- B. CO2 with NH2 group of haemoglobin
- C. O2 with Fe of haem
- D. H+ with COOH group of haemoglobin
Explanation: •The binding of the inorganic component in the structure found in erythrocytes (red blood cells) involves the binding of oxygen (O2) with…
Correct answer: O2 with Fe of haem- A. Mesodermal cells
- B. Epidermal cells
- C. Endodermal cells
- D. Epithelial cells
Explanation: The tiny hair-like structures found on the roots are called root hairs, and they are extensions of the epidermal cells of the root.
Correct answer: Epidermal cells