Proteins are macromolecules that are made up of the subunits that are called amino acids, there are 20 fundamental kinds of amino acids present. These varying combinations of them make different proteins needed for numerous functions.
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adrenal gland smooth muscle in the walls of the aorta cardiac muscle in the right atrium
Answer:
The answer is D: The hormone is released into the bloodstream where it can be transported to all cells with the correct receptors.