Answer:
<u><em>stapes</em></u>
The stapes is the smallest and lightest bone in the human body and is so-called because of its resemblance to a stirrup (Latin: Stapes).
Explanation:
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Circulatory system
The circulatory system is the transport system for endocrine information. While the nervous system uses neurons, the endocrine chemicals and hormones must circulate through the body via blood vessels. Many glands in your body secrete hormones into the blood.