All hormones

Question

All hormones

BlackTom AI · Accepted Answer

The question presents five statements about all hormones and asks us to evaluate them.
Option 1: 'Are secreted by endocrine glands through ducts into the blood' — This is inaccurate because most endocrine glands are ductless and release hormones directly into the bloodstream. The phrase 'through ducts' is characteristic of exocrine secretions, not typical endocrine hormone release. Therefore this option is incorrect.
Option 2: 'Are regulated by the hypothalamus' — While the hypothalamus exerts major regulatory control over many hormones (via releasing and inhibitory hormones), not all hormones are regulated by the hypothalamus. Some hormones are regulated by other organs, feedback loops, or stimuli independent of the hypothalamus. Thus this statement is not universally true for all hormones and is better described as true for a subset rather than all.
Option 3: 'Initiate synthesis of new proteins' — Hormones can influence gene expression and protein synthesis in target cells, but they do not universally initiate the synthesis of new proteins. Some hormones may affect enzyme activity, second messenger cascades, or other processes without altering protein synthesis, while others do influence synthesis. This blanket claim is thus oversimplified and not universally true.
Option 4: 'Are produced in a gland and target cells in different tissues' — This statement asserts that hormones are produced by glands and act on target cells in different tissues, which captures the classic endocrine signaling model: endocrine glands secrete hormones into the bloodstream to reach distant targets. While there are exceptions (such as autocrine or paracrine signaling, or hormones acting on nearby tissues), the core concept described here aligns with the general understanding of hormonal action. Therefore this option is presented as the correct one in the provided data, and its premise is largely accurate for the intended definition of hormones, distinguishing endocrine signaling from direct exocrine action.
In summary, each incorrect option either misstates the secretion pathway, overgeneralizes regulation, or oversimplifies mechanism, while the selected option accurately captures the central idea of hormones being produced by glands and acting on distant target tissues, despite some exceptions in physiology.

All hormones单项选择题

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