Discuss the roles of the first messenger and the second messenger in the second-messenger system
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The first messenger is the hydrophilic hormone that binds to a receptor in the plasma membrane. The binding of the first messenger to the receptor activates an enzyme, which catalyzes the formation of a second messenger inside the cell. The second messenger initiates a series of events in the cell that leads to changes in its activity. The second messenger, not the first messenger, is the molecule actually initiating the cellular change in activity.
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Which of the following is incorrect pertaining to the deep (internal) inguinal ring?
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