When are second messengers needed? Select one: a. When molecules are bound to protein complexes b. When molecules don't use ATP until their last shape change c. When molecules are not lipid soluble d. When molecules are in a high-energy, unstable state Endocrine cells: Select one: a. Release their secretions directly into body fluids b. Contain few vesicles c. Release their secretions onto an epithelial surface d. Are modified connective tissue cells e. Are a type of nerve cell
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This is because lipid soluble molecules can easily pass through the cell membrane and directly interact with intracellular receptors. However, molecules that are not lipid soluble cannot pass through the cell membrane and therefore need to use second messengers to Show more…
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