Answer:ryanodine receptor, or RYR) in the sarcoplasmic reticulum (SR), causes opening of the RYR. In cardiac muscle, opening of the L-type calcium channel permits influx of calcium into the cell
Explanation:
<span>In general, a species' realized niche will be smaller than its fundamental niche due to interactions with other organisms in the community.
Hope that helped you.
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Glucagon is <span>protein hormone that is produced by the pancreas to promote the increase in the sugar content of the blood by breaking down glycogen in the liver.</span>
<span>B. Serve a different function I think</span>
