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Body Fluids and Circulation Test - 18

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Body Fluids and Circulation Test - 18
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  • Question 1
    1 / -0
    Mast cells of connective tissue release
    Solution
    A  mast cell  is derived from the myeloid stem cell and contains many granules rich in histamine and heparin. Mast cells play an important role in allergy and anaphylaxis and are involved in wound healing and defence against pathogens. So, the correct answer is option B.
  • Question 2
    1 / -0
    Blood vessel carrying blood from lung to heart through-
    Solution
    • The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs.
    • The pulmonary vein carries oxygenated blood from the lungs to the left auricle.
    • The coronary artery supplies oxygenated blood to the heart muscles. 

    So the correct answer is option B.
  • Question 3
    1 / -0
    The diagram given here is the standard ECG of a normal person. The P-wave represents the

    Solution

     Solution:

    Correct answer is option D.
    Explanation for correct option:

    • ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. 
    • Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart.
    • The P-wave represents the electrical excitation (or depolarization) of the atria, which leads to the contraction of both the atria.

  • Question 4
    1 / -0
    Blood and lymph are types of
    Solution
    Blood consists of fluid or liquid matrix called plasma in which white blood cells, red blood cells, and platelets are suspended.  
    Lymph is clear to whitish liquid in which white blood cells are suspended.
    In both, blood and lymph the cells are suspended in a fluid matrix. Connective tissue contains loosely spaced cells, which are embedded in rigid, jelly-like, fluid or dense matrix. Hence, option C is correct.
  • Question 5
    1 / -0
    Arteries of mummies were found to be well preserved due to
    Solution
    Mummies are embalmed corpse either of human or animal. The skin and organs of mummies are preserved in such a way that the recovered body does not decay further if kept in cool and dry conditions. while creation of mummies have been anthropogenic or spontaneous, studies of the areolar connective tissue cells have shown to contain elastin fibres. Elastin is a body protein which is more resistant of all against any chemical changes and body proteins. Hence, arteries of mummies are preserved due to the presence of elastin fibres.
  • Question 6
    1 / -0
    The amount of pericardial fluid in human beings is 
    Solution
    The serous fluid which is secreted by the serous layer of the pericardium into the pericardial cavity is called as pericardial fluid. In human beings, 15 ml of pericardial fluid is released and reduces friction within the pericardium by lubricating the epicardial surface allowing the membranes to glide over each other with each heart beat. So, the correct answer is option B.
  • Question 7
    1 / -0
    Mammals are said to have double circulation. It means
    Solution
    • Humans have double circulation. The blood pumped by the right ventricle enters the pulmonary artery, whereas the left ventricle pumps blood into the aorta. 
    • The deoxygenated blood pumped into the pulmonary artery is passed onto the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium. 
    • This pathway constitutes the pulmonary circulation. 
    The oxygenated blood entering the aorta is carried by a network of arteries, arterioles and capillaries to the tissues from where the de-oxygenated blood is collected by a system of venules, veins and vena cava and emptied into the right atrium. 
    This is the systemic circulation. 

    So, the correct answer is option D.
  • Question 8
    1 / -0
    Erythropoiesis may be stimulated by the deficiency of
    Solution
    Erythropoiesis is the process whereby erythroid precursor cells proliferate and differentiate into RBCs. It is stimulated by the decrease in the level of oxygen in the blood, that is detected by the kidneys, which then secrete the hormone erythropoietin. Erythropoietin stimulates proliferation and differentiation of red cell precursors, which activates increased erythropoiesis in the haemopoietic tissues like bone marrow
    So, the correct answer is 'Oxygen'
  • Question 9
    1 / -0
    What is diapedesis?
    Solution
    Diapedesis is the squeezing movement of WBC at the site of infection.
    It can be defined as the passage of blood, or any of its formed elements, through the intact walls of blood vessels. White blood cells (WBCs), also called leukocytes are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells. Leukocytes are found throughout the body, including the blood and lymphatic system.
    Hence the correct option is C.

  • Question 10
    1 / -0
    Match the names with the tissues shown. Choose the answer, which gives the correct combination of the alphabets.
    Cells
    		Tissues
    A. Erythocytes
    		p. Bone
    B. Chondrocytes
    		q. Neuron
    C. Osteocytes
    		r. Cartilage
    D. Schwann cells
    		s. Blood

    		t. Adipose tissue
    Solution
    Erythrocytes are the red blood cells and are the most common type of blood cells. 
    Chondrocytes are the only cells found in healthy cartilage. 
    The osteocyte is a star-shaped cell and is most commonly found in mature bones. 
    The myelin sheath of the neuron is formed by Schwann cells and each Schwann cell covers a part of the axon. 
    Thus, the correct answer is option B. 
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