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Body Fluids and Circulation Test - 10

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Body Fluids and Circulation Test - 10
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  • Question 1
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    Which blood vessel does not carry any carbon dioxide?
  • Question 2
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    Conversion of fibrinogen to fibrin is catalysed by
    Solution
    Thrombin catalyzes the conversion of fibrinogen (factor I)—a soluble plasma protein into long, sticky threads of insoluble fibrin . The fibrin threads form a mesh that traps platelets, blood cells, and plasma.The fibrin mesh work begins to contract in a short period of time and prevents blood loss. 
    So, the correct answer is 'Thrombin'
  • Question 3
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    Compounds released by WBCs, which raise the body's temperature, are known as
    Solution
    When your body temperature rises because of an infection, it's called a fever.  Fevers are caused by chemicals called pyrogens flowing in the bloodstream. Pyrogens make their way to the hypothalamus in the brain, which is in charge of regulating body temperature. So, the correct option is "C" (Pyrogens).
  • Question 4
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    The white blood cells, which play a very important role in protecting the body against disease-producing organisms
    Solution
    White blood cells are bigger than red blood cells and normally are fewer in number. WBC are 12 - 17 µm in diameter whereas A typical human red blood cell has a disk diameter of approximately 6.2–8.2 µm. The normal number of WBCs in the blood is 4,500 to 11,000 WBC per microliter whereas The normal RBC range for men is 4.7 to 6.1 million cells per microliter . So, the correct option is C. ( Are larger in size and fewer in number than the red blood cells )
  • Question 5
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    Most of our cells are surrounded by- 
    Solution
    It is the main component of the extracellular fluid and transcellular fluid. The interstitial fluid is found in the spaces between cells or the tissue spaces.It consists of a water solvent containing sugars, salts, fatty acids, amino acids, coenzymes, hormones, neurotransmitters, white blood cells and waste products from the cell.The composition of tissue fluid depends upon the exchanges between the cells in the biological tissue and the blood. 
    So, the correct answer is Interstitial Fluid."

  • Question 6
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    Choose the schematic diagram which properly represents pulmonary circulation in humans.
    Solution
    The correct answer is C.
    The right ventricle pumps oxygen-poor blood through the pulmonary valve into the main pulmonary artery. From there, the blood flows through the right and left pulmonary arteries into the lungs. In the lungs, oxygen is put into the blood and carbon dioxide is taken out of the blood during the process of breathing. After the blood gets oxygen in the lungs, it is called oxygen-rich blood. Oxygen-rich blood flows from the lungs back into the left atrium, or the left upper chamber of the heart, through four pulmonary veins.
  • Question 7
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    In man, blood passes from the post caval into the diastolic right atrium of the heart because of
    Solution
    Blood passes from the superior and inferior vana cava into the right atrium. During the start of diastole, the pressure drops in the right atrium, thereby forcing the blood from vena cava to enter the right atrium. During diastole as the atrium relaxes and enlarges in size, the pressure falls.
  • Question 8
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    Regarding blood circulation, it may be said that in Pheretima the dorsal vessel is a
    Solution
    In earthworm (Pheretima) the blood vascular system is of closed type. It is different and modified in the first thirteen segments than that of the intestinal region. There are two types of vessels- collecting blood vessels and distributing blood vessels. The dorsal blood vessel is the distributing vessel instead of the collecting vessel in the first 13 segments. Behind the 14th segment i.e intestinal region.this vessel is the main collecting vessel. Thus the correct answer is option D.
  • Question 9
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    The artery which supplies blood to the diaphragm is known as
    Solution
    A pair of phrenic arteries arise from the aorta and supply the diaphragm. The inferior phrenic arteries supply the diaphragm. They arise either from the aorta or from the celiac artery. The superior phrenic arteries arise from the lower part of the thoracic aorta. They join with the musculophrenic and pericardiacophrenic arteries.
    So, the correct answer is 'Phrenic artery'
  • Question 10
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    Blood enters the heart because muscles of the ___________.
    Solution
    Blood enters from the superior and inferior venae cavae into the right atrium during the relaxation phase of the atrium. The pressure difference between the venae cavae and inside chamber of the right atrium allows the deoxygenated blood to enter the heart. 
    So, the correct answer is option 'B'.
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