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Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Related Experiment Video

Updated: Jun 4, 2026

Paired Cisterna Magna Nanoinjection and Laser Speckle Contrast Imaging Assay to Study Cerebral Blood Flow Regulation In Vivo
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Paired Cisterna Magna Nanoinjection and Laser Speckle Contrast Imaging Assay to Study Cerebral Blood Flow Regulation In Vivo

Published on: July 8, 2025

Functional studies of the cerebral circulation.

J H Lombard

    Methods in Molecular Medicine
    |February 19, 2011
    PubMed
    Summary

    Angiotensin II (Ang II), a peptide regulating blood pressure and cardiovascular growth, exhibits both vasoconstrictor and vasodilator effects. Its actions are further complicated by distinct AT(1) and AT(2) receptor subtypes, impacting cardiovascular regulation.

    Area of Science:

    • Cardiovascular Physiology
    • Endocrinology
    • Molecular Biology

    Background:

    • Angiotensin II (Ang II) is a key endogenous peptide with diverse physiological roles.
    • It regulates hemodynamics, blood volume, cardiovascular growth, and vascular tone.
    • Ang II is recognized for potent vasoconstriction but also exhibits vasodilator effects.

    Purpose of the Study:

    • To explore the complex actions of Angiotensin II on the vasculature.
    • To investigate the role of distinct AT(1) and AT(2) angiotensin receptor subtypes.
    • To understand the implications for overall cardiovascular regulation.

    Main Methods:

    • Review of existing scientific literature on Angiotensin II.
    • Analysis of studies investigating Ang II's effects on blood vessels.

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  • Examination of research on AT(1) and AT(2) receptor subtypes.

    • Main Results:

    • Angiotensin II demonstrates a dual role, acting as both a vasoconstrictor and vasodilator.
    • The identification of AT(1) and AT(2) receptors adds complexity to Ang II's vascular actions.
    • These receptors are crucial for understanding Ang II's influence on cardiovascular regulation.

    Conclusions:

    • Angiotensin II's vascular effects are multifaceted, involving both constrictive and dilatory mechanisms.
    • The specific roles of AT(1) and AT(2) receptors are critical for deciphering Ang II's overall cardiovascular impact.
    • Further research into these receptor subtypes is essential for a comprehensive understanding of cardiovascular regulation.