Biology Today - May 2018

33. In normal ECG which of the segment shows the correct
    representation of respective activity of the human heart?
    (a) P - depolarisation of atria
    (b) R - repolarisation of ventricles
    (c) S - start of systole
    (d) T - end of diastole


34. Select the correct statement regarding the blood pressure.
    (a) 100/55 mmHg is considered an ideal blood pressure.
    (b) 130/90 mmHg is considered high and requires
    treatment.
    (c) 190/110 mmHg may harm vital organs like brain and
    kidney.
    (d) 105/50 mmHg makes one very active.


35. Select the incorrect match.
    (a) Aortic semilunar valve - Allows unidirectional flow of
    oxygenated blood from
    left ventricle to aorta
    (b) Mitral valve - Allows the blood to move
    from left atrium to left
    ventricle
    (c) Eustachian valve - Guards opening of
    coronary sinus
    (d) Tricuspid valve - Allows the blood to move
    from right atrium to right
    ventricle


36. Doctors use stethoscope to hear the sounds produced
    during each cardiac cycle. The second sound is heard when
    (a) AV node receives signal from SA node
    (b) AV valves open up
    (c) ventricular walls vibrate due to gushing in of blood from
    atria
    (d) semilunar valves close down after the blood flows into
    vessels from ventricles. (AIPMT 2015)


37. Consider the following statements and select the correct
    option stating which ones are true (T) and which ones are
    false (F).
    (i) Cardiac centre lies in the medulla oblongata of the brain.
    (ii) Tachycardia is the term indicating slow heart pulse rate.
    (iii) Cardiac output of humans is approximately 5 litres per minute.
    (iv) The first sound has a duration of 0.12 seconds and
    frequency of 40-50Hz.
    (i) (ii) (iii) (iv)
    (a) T T F F
    (b) T F T F
    (c) F T T F
    (d) F T F T


38. Which layer of the heart is composed of cardiac muscle
    cells?
    (a) Epicardium (b) Myocardium
    (c) Endocardium (d) All of these
    39. Read the following statement and select the correct option.
    Statement A : Wall of the ventricles are thicker than the
    auricles.
    Statement B : Chordae tendineae are attached to cone
    shaped projections of the ventricular wall known as
    papillary muscles.
    (a) Both statements A and B are correct and B is the
    correct explanation of A.
    (b) Both statements A and B are correct but B is not the
    correct explanation of statement A.
    (c) Statement A is correct but B is incorrect.
    (d) Both statements A and B are incorrect.
    40. The first heart sound is caused by the closure of A and
    B valve.
    A B
    (a) bicuspid aortic semilunar
    (b) bicuspid tricuspid
    (c) tricuspid pulmonary semilunar
    (d) Eustachian thebasian
    41. Blood pressure in the pulmonary artery is
    (a) more than that in the pulmonary vein
    (b) less than that in the vena cava
    (c) same as that in the aorta
    (d) more than that in the carotid.
    (NEET-I 2016)
    42. What is the stroke volume of an adult human heart?
    (a) 50 mL (b) 70 mL
    (c) 90 mL (d) 100 mL
    (West Bengal 2015)
    43. The correct route through which pulse-making impulse
    travels in the heart is

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