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Give This Thread Specification: 3/8-24 UNF-3A MOD (21) MAJOR DIA

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Give this thread specification: 3/8-24 UNF-3A MOD (21) MAJOR DIA .3648-.3720 MOD, describe the meaning of the MOD and (21) parts of the note.


Definitions:

Excitation Reaction

A physiological response that increases the activity or efficiency of a part of the body or brain.

Receptor Sites

Specific regions on the surface of a cell where molecules such as neurotransmitters can bind to initiate a cellular response.

Agonist

A substance that fully activates the receptor it binds to, producing a full biological response.

Antagonist

In physiology, a muscle that acts in opposition to the action of another muscle, called the agonist; in pharmacology, a substance that inhibits the action of another substance.

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