Hormone Administration
Hormone Administration - Related Videos
02:13
Types of Hormones
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2019
Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells. Steroid hormones are derived from cholesterol and are lipophilic in nature. This allows them to readily traverse the lipid-rich cell membrane to bind to their intracellular receptors in the cytoplasm or nucleus. Once bound, the cytoplasmic hormone-receptor complex translocates to the nucleus.
01:33
Hormonal Regulation
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2019
The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
01:56
Plant Hormones
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2020
Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands. Instead, plant hormones are often produced in regions of active growth, like the tips of roots and shoots. Additionally, even very low concentrations of plant hormones can have a profound effect on growth and development processes.
09:29
Self-administration Studies
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2023
Behavioral reinforcement induced by the rewarding feelings following substance use sometimes leads to addiction, which is demonstrated by increased self-administration. Drug self-administration studies in rodents model human behavior during drug abuse. These models are useful in understanding the neurobiological behavior of addiction in order to help scientists discover new treatments for drug dependence. This video reviews the concepts underlying self-administration studies. A general...
09:38
Compound Administration II
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2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN Compound administration is often an integral component of an animal study. Many factors need to be evaluated to ensure that the compound is delivered correctly. The route of administration affects the mechanisms of absorption. The characteristics of the substance to be introduced (the pH, viscosity, and concentration) may dictate which route of administration is selected.
FAQs
The response depends on whether administered hormones bind receptors in particular target cells. Receptor engagement can alter gene expression, enzyme activity, or cellular signaling, so the same delivery may produce different effects in different tissues. This receptor-level selectivity helps investigators connect an observed physiological change to a specific cellular pathway rather than treating the organism-wide response as uniform.
Dose and timing can change both the magnitude and duration of a physiological response. Because endocrine systems use feedback mechanisms, an administered hormone may influence subsequent signaling and alter the organism’s own regulation. Varying concentration and exposure schedule therefore helps researchers distinguish immediate hormone actions from secondary changes that emerge as feedback modifies the system.
Researchers distinguish a direct hormone effect from broader systemic changes by controlling concentration, delivery route, and exposure duration. A response that appears soon after exposure or under a specific delivery condition may provide different evidence than a delayed, organism-wide change. Comparing these controlled conditions clarifies whether the hormone acts directly on target cells or indirectly through altered endocrine regulation.
A reliable procedure should specify the hormone concentration, delivery route, and exposure duration before physiological outcomes are assessed. Injection, oral dosing, and topical application can create different exposure conditions, while timing affects feedback responses. Keeping these variables controlled allows comparisons among experimental groups and improves interpretation of changes in development, metabolism, reproduction, or stress responses.
Biologists use this approach to investigate how endocrine signals influence development, metabolism, reproduction, and stress responses. Controlled delivery can help test the consequences of replacing a deficient signal or changing hormone exposure under defined conditions. By linking the treatment schedule to measured physiological changes, researchers can examine endocrine function without relying only on naturally occurring fluctuations.
These experiments can indicate how restoring or altering a hormonal signal affects physiological processes associated with endocrine dysfunction. Results may show whether a response depends on concentration, route, or duration of exposure, while feedback effects reveal how the broader system adapts. This information supports biological understanding of deficient signaling and can also inform treatment-related investigations.