The $pH$ of blood in an artery and a vein is:

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 of the following figures correctly represents the path of a closed circulatory system?

What is the need for a circulatory system?

Which of the following substances can cause vasodilation?

If cardiac output is $4200 \text{ ml/min}$,then $x$ beats/min is the heart rate and $y$ is the term for pulse rate.