What is the function of the spleen in humans?

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Question

(D) The spleen is a secondary lymphoid organ that performs several vital functions in the human body:$1$. It acts as the 'Graveyard of $RBCs$' because

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All of the above

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(D) The spleen is a secondary lymphoid organ that performs several vital functions in the human body:$1$. It acts as the 'Graveyard of $RBCs$' because it filters out old and damaged red blood cells.$2$. It serves as a 'Blood reservoir',storing a significant volume of blood that can be released during emergencies like hemorrhage.$3$. It is often referred to as a 'Blood organ' due to its role in hematopoiesis during fetal development and its role in immune surveillance.Therefore,all the given options are correct.

Column-$I$	Column-$II$
$a.$ Joint diastole	$(i)$ $0.8$ second
$b.$ Heart beat	$(ii)$ All four chambers of heart are relaxed.
$c.$ Cardiac cycle	$(iii)$ $72$ times/min
$d.$ Stroke volume	$(iv)$ $70$ mL

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Which of the following is a characteristic of pernicious anemia?

Match the Column-$I$ and Column-$II$.
Column-$I$ Column-$II$
$a.$ Joint diastole $(i)$ $0.8$ second
$b.$ Heart beat $(ii)$ All four chambers of heart are relaxed.
$c.$ Cardiac cycle $(iii)$ $72$ times/min
$d.$ Stroke volume $(iv)$ $70$ mL

Choose the correct answer from the options given below:

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

Select the correct option regarding the circulatory system.

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