The figure below shows an electron micrograph of a portion of one insect flight muscle cell.Identify the structures labeled A and B. 
Definitions:
Previously Undisclosed Principal
A principal whose identity was not revealed by the agent at the time of entering into a contract with a third party.
Third Party
An entity that is not directly involved in a transaction or contract but may be affected by it or may have interests that are affected.
Constructive Notice
Notice of agency termination that is usually given by publishing an announcement in a newspaper.
Agency Termination
The act of ending the relationship between an agent and their principal, which can occur for various reasons including mutual agreement, achievement of the agency's purpose, or breach of contract.
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