MCQ

In the above picture $Q$ represents.
- AExitation of the atria.
- BDepolarisation of ventricles.
- ✓Begining of systole.
- DRepolarisation.

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Components:
$(i)$ Cristae of mitochondria
$(ii)$ Inner membrane of mitochondria
$(iii)$ Cytoplasm
$(iv)$ Smooth endoplasmic reticulum
$(v)$ Rough endoplasmic reticulum
$(vi)$ Mitochondrial matrix
$(vii)$ Cell vacuole
$(viii)$ NucleusThe correct components are: