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Any given hormone will influence the activity of __________.
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16. The Endocrine System
Introduction to the Endocrine System
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In which of the following mechanisms of hormone action do intracellular calcium ions act as a final mediator?
A
DAG
B
cAMP
C
cGMP
D
PIP2-calcium signaling mechanism
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Begin by understanding the role of intracellular calcium ions in hormone signaling. Calcium ions often act as secondary messengers in various signaling pathways, amplifying the signal initiated by the hormone.
Identify the PIP2-calcium signaling mechanism. This mechanism involves the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) by the enzyme phospholipase C, which is activated by a hormone-receptor interaction.
Recognize that the hydrolysis of PIP2 results in the formation of two secondary messengers: inositol trisphosphate (IP3) and diacylglycerol (DAG). IP3 is responsible for the release of calcium ions from intracellular stores.
Understand that the released calcium ions act as a final mediator in the signaling pathway, leading to various cellular responses such as muscle contraction, secretion, or metabolism changes.
Compare this mechanism with others like cAMP and cGMP, which do not primarily use calcium ions as a final mediator. This helps in identifying the unique role of calcium in the PIP2-calcium signaling mechanism.
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