Figure 49-1 
Refer to the accompanying figure. Which of the following is a steroid hormone?
Definitions:
Seromucous Gland
A gland that produces both serous fluid (a watery solution) and mucous (a thicker, protective secretion).
Diaphragm
A large, dome-shaped muscle located at the base of the lungs that plays a key role in breathing.
Alveoli
Tiny air sacs within the lungs where the exchange of oxygen and carbon dioxide takes place.
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