In the diagram,what is the basic functional unit of a myofibril? 
Definitions:
Cultural Norms
Common standards and regulations directing the conduct of members within social communities.
Commitment
denotes a state or quality of being dedicated to a cause, activity, or relationship, often implying a long-term engagement or obligation.
Phenylethylamine
A natural monoamine alkaloid, functioning within the human central nervous system as a neuromodulator or neurotransmitter.
Euphoria
An intense state of happiness, confidence, or well-being, sometimes naturally occurring or as a result of certain activities or substances.
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