Find the direction in which the function 
decreases fastest at the point 
.
Definitions:
Structural Unit
The smallest part of an organ or structure that retains all the characteristics of the organ or structure.
ATPase
An enzyme that catalyzes the decomposition of ATP into ADP and a free phosphate ion, which releases energy used to drive many processes in living cells.
Myosin Heads
Part of the myosin molecule that binds to actin filaments and is crucial for muscle contraction.
F-actin
F-actin, or filamentous actin, is a polymerized form of actin filaments that is a key component of the cytoskeleton, involved in cell movement, stability, and division.
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