Which of the labeled steps in the diagrams do NOT involve contraction of any respiratory muscles? 
Definitions:
Compound Acinar
A type of glandular structure in which secretory cells form sac-like acini connected to ducts, found in some exocrine glands such as the pancreas and salivary glands.
Branching Ducts
Part of the ductal system in various glands, branching off to increase the area of influence or secretion within an organ.
Simple Acinar
Pertaining to a type of simple glandular structure in the epithelium that has a single secretory duct and is typically globular in shape.
Holocrine Gland
Gland whose secretion is formed by the disintegration of entire cells (e.g., sebaceous gland).
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