Systolic pressure in an adult human is

$QRS$ complex is related to

The $QRS$ complex in a standard $ECG$ represents:

Which of the following values indicates hypertension?

Complete the missing words in the statements given below:
$(a)$ Plasma without clotting factors is called serum.
$(b)$ $.........$ and monocytes are phagocytic cells.
$(c)$ Eosinophils are associated with $.........$ reactions.
$(d)$ $.........$ ions play a significant role in clotting.
$(e)$ One can determine the heart beat rate by counting the number of $.........$ in an $ECG$.

The diagram given here is the standard $ECG$ of a normal person. The $P$-wave represents the