When does the muscle labeled C contract? 
Definitions:
Underactive Thyroid
A condition also known as hypothyroidism, where the thyroid gland doesn't produce sufficient hormones, affecting metabolism and energy levels.
Underactive Pituitary
A condition where the pituitary gland does not produce adequate amounts of certain hormones, which can affect various bodily functions.
Endocrine System
A network of glands and organs that secrete hormones directly into the bloodstream to regulate bodily functions and processes.
Somatic System
A part of the peripheral nervous system that handles voluntary control of body movements via skeletal muscles.
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