Caption: Inside the muscle's sarcoplasmic reticulum DHP receptors open channels and release calcium into the cell's cytoplasm. As an action potential spreads along the sarcolemma, it is carried deep into the myofibril along transverse tubules. During this process, dihydropyridine receptors, also known as DHP receptors, are depolarized. The DHP receptors change shape, causing them to physically pull on ryanodine receptors of the sarcoplasmic reticulum. This triggers the opening of calcium channels, and the release of calcium from the sarcoplasmic reticulum into the cytoplasm of the cell.

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Keywords: action potential, calcium, calcium channel, cytoplasm, dhp, dihydropyridine, muscle, muscle contraction, muscular system, myofibre, ryanodine, sarcoplasmic reticulum

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Sarcoplasmic reticulum DHP receptors

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