The given figure shows the schematic plan of blood circulation in humans with labels $A$ to $D$. Identify the label and give its function/functions.

  • A
    $D -$ Dorsal aorta - takes blood from heart to body parts,$PO_2 = 95 \, mm \, Hg$
  • B
    $A -$ Pulmonary vein - takes impure blood from body parts,$PO_2 = 60 \, mm \, Hg$
  • C
    $B -$ Pulmonary artery - takes blood from heart to lungs,$PO_2 = 90 \, mm \, Hg$
  • D
    $C -$ Vena cava - takes blood from body parts to right atrium,$PCO_2 = 45 \, mm \, Hg$

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Which of the following statements is correct?

Match the following:
Disease: Cause
$A.$ Diabetes: $6.$ Increase in blood sugar level
$B.$ Uraemia: $7.$ Urea is in excess in blood
$C.$ Anaemia: $5.$ Fall in $RBC$ count
$D.$ Polycythemia: $3.$ Rise in $RBC$ count
$E.$ Pernicious or Megaloblastic anaemia: $2.$ Deficiency of vitamin ${B_{12}}$
$F.$ Leukemia: $8.$ Pathological increase in $WBC$
$G.$ Thrombocytopenia: $9.$ Decrease in the number of platelets
$H.$ Leucopenia: $4.$ Fall of $WBC$ count
$I.$ Leucocytosis: $1.$ Rise in $WBC$ count
The correct matching sequence is:

Which one of the following is a matching pair of a certain body feature and its value/count in a normal human adult?

Differentiate between closed circulatory system and open circulatory system.

Statement-$I$: The first heart sound $(lub)$ is associated with the opening of the tricuspid and bicuspid valves.
Statement-$II$: Cardiac output of an athlete is much higher than that of an ordinary man.

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