Which hormone would be produced by structure B? 
Definitions:
Capillaries
The smallest blood vessels in the body, connecting arteries to veins, which facilitate the exchange of water, oxygen, carbon dioxide, and many other nutrient and waste substances between blood and surrounding tissues.
Arteries
Blood vessels that carry oxygen-rich blood away from the heart to the body.
Echocardiography
Echocardiography is a diagnostic procedure that uses ultrasound waves to create images of the heart, allowing for the assessment of its structure and function.
Electrocardiogram
A test that measures the electrical activity of the heart to show whether it is working normally or to detect heart conditions.
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