Question

what is a synapse?
a functional connection between neuron and effector
a part of thick filament that interacts with thin filament
a point of contact between adjacent sarcomeres
an invagination of sarcolemma into the sarcoplasm of muscle fiber
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Explanation:

A synapse is a functional connection between neurons (or between a neuron and an effector like a muscle or gland cell). It is where nerve - impulses are transmitted from one neuron to another or to an effector. The other options describe components related to muscle structure (thick and thin filaments, sarcomeres, and invaginations in muscle fibers) which are not related to synapses.

Answer:

A. A functional connection between neuron and effector