Answer:
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Answer:
A <u><em>receptor</em></u> is a protein that recognizes and responds to a signal.
Explanation:
A receptor is a protein molecule present on the cells on which the signalling molecules can bind and generate a physiological response. Some receptor molecules can also respond to Sun and light. Each type of cell has specific receptors molecules and hence can respond to specific signals. The receptor molecules hence tend to receive signals for a cell. Molecules such as hormones bind to the receptors.
The answer to your question is A.
"A nephron is used to separate water, ions, and small molecules from the blood, filter out wastes and toxins, and return needed molecules to the blood."
https://biologydictionary.net/nephron/
