How is the sliding filament mechanism acting in the brachialis muscle when you set down a glass?

Interpreting as: brachialis muscle
Input interpretation:
brachialis (human)

Latin name:
musculus brachialis

Alternate names:
Casserio's muscle | brachialis muscle

Hierarchy relationships:
systemic groups | muscular system
anatomical groups | muscle | muscle of anterior compartment of arm | musculature of anterior compartment of arm | musculature of arm
structural groups | arm | anterior part of elbow | anterior compartment of arm | upper limb
anatomical spaces | space of anterior compartment of arm
regional parts | belly of brachialis | distal zone of brachialis | head of brachialis
bilateral components | right brachialis | left brachialis

Definitions