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As described in Figure 16-13 of Essential Cell Biology, 5 th ed., most cell-surface signal receptors fall into one of three classes. Which of the following receptors would most directly alter the membrane potential in response to signal? a trimeric G-protein-coupled receptor an enzyme-coupled receptor that is regulated by cytoplasmic levels of$$\mathrm{Ca}2+$$an enzyme-coupled receptor that phosphorylates ion channels. an ion-channel-coupled receptor

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The Ca2 + pump in the sarcoplasmic reticulum (SR) is essential for muscle movement. This pump is also present in the endoplasmic reticulum of most mammalian cells. As shown in Figure 12-14 of Essential Cell Biology, 5 th ed., this Ca2+ pump uses the energy of to move$$\mathrm{Ca}2+$$ions from the to the ATP hydrolysis; cytoplasm; SR lumen ATP hydrolysis; SR lumen; cytoplasm the Ca2+ concentration gradient; cytoplasm; SR lumen the$$\mathrm{Ca}2+$$concentration gradient; SR lumen; cytoplasm. Essential Cell Biology Essay Example