Which of the following is the primary site for the breakdown of proteins and the formation of free amino acids?

Which of the following is a characteristic of pernicious anemia?

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:

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.

The organ that acts as a filter for blood is:

What is the function of the spleen in humans?