Multiple Choice
cAMP, , and DAG are all molecules that are used as secondary messengers. Which statement below correctly identifies a difference between the pathways in which they are found?
16. The Endocrine System
Membrane Bound Receptors and Secondary Messengers
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Which of the following is true about water-soluble hormones?
A
They are composed of lipids.
B
They cannot be stored in secretory vesicles.
C
They have a short half-life.
D
They are bound to a transport protein while circulating in the blood.
Verified step by step guidance1
Understand the nature of water-soluble hormones: Water-soluble hormones are typically composed of amino acids or peptides, not lipids. This is a key characteristic that differentiates them from lipid-soluble hormones.
Consider the storage mechanism: Water-soluble hormones can be stored in secretory vesicles within the cells that produce them. This allows for their rapid release into the bloodstream when needed.
Evaluate the half-life: Water-soluble hormones generally have a short half-life. This means they are quickly broken down and removed from the bloodstream, requiring frequent release to maintain their effects.
Examine the transport method: Unlike lipid-soluble hormones, water-soluble hormones do not require transport proteins to circulate in the blood. They dissolve directly in the plasma due to their solubility in water.
Summarize the characteristics: Based on the above points, the statement 'They have a short half-life' is true for water-soluble hormones, while the other options do not accurately describe their properties.
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