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THE MECHANISM OF AOETIC FUNCTION
Saydaliyeva Rohatoy Zaylobidinovna
Assistant of Physiology at CAMU International Medical University
E-mail:
Abstract:
The aorta, the largest artery in the human div, plays a crucial role in systemic
circulation by distributing oxygen-rich blood from the heart to the rest of the div. Its function is
regulated by complex biomechanical properties, elastic recoil, endothelial function, and
neurohormonal control. This review explores the structural and functional mechanisms of the
aorta, emphasizing vascular compliance, hemodynamics, and pathophysiological changes
associated with aging and disease. Twenty scholarly sources provide insights into recent
advancements in aortic research.
Keywords:
Aorta, hemodynamics, vascular elasticity, endothelial function, pulse wave velocity,
nitric oxide (NO), renin-angiotensin system, aortic compliance, arterial stiffness, hypertension,
atherosclerosis, aortic aneurysm, windkessel effect, smooth muscle cells, elastin, collagen,
biomechanical properties, blood circulation, cardiovascular diseases, autonomic regulation.
The aorta serves as the main conduit for blood leaving the heart, ensuring continuous perfusion
of tissues. Its function is highly dependent on its elastic properties, endothelial integrity, and
interaction with neurohormonal factors. Understanding these mechanisms is essential for
diagnosing and managing cardiovascular diseases such as aortic aneurysms, atherosclerosis, and
hypertension.
The aortic wall consists of three primary layers. Tunica intima: A thin endothelial layer that
regulates vascular tone and prevents thrombosis.
Tunica media: Composed of smooth muscle cells and elastin, responsible for the aorta's elastic
properties.
Tunica adventitia: A connective tissue layer providing structural support. The unique
biomechanical properties of these layers allow the aorta to withstand high-pressure pulsatile
blood flow.
Pulse wave propagation. The aorta functions as a windkessel (elastic reservoir) that buffers
pulsatile blood flow, reducing cardiac workload. As blood is ejected from the left ventricle, the
aorta expands and then recoils, maintaining continuous blood flow.
Role of elastin and collagen. Elastin provides elasticity, allowing the aorta to stretch during
systole and recoil during diastole. Collagen fibers contribute to tensile strength and prevent
overexpansion. With aging, elastin degrades, and collagen deposition increases, leading to
reduced aortic compliance and higher pulse pressure.
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The endothelium plays a critical role in: Vasodilation: Mediated by nitric oxide (NO),
prostacyclin, and endothelium-derived hyperpolarizing factors (EDHF) .
Vasoconstriction: Controlled by endothelin-1 and angiotensin II. Dysfunction of the endothelium
is a key factor in aortic diseases such as atherosclerosis and hypertension.
Neurohormonal control of aortic function. The aorta is influenced by the autonomic nervous
system and various hormones: Sympathetic stimulation (norepinephrine) increases vascular
resistance. Parasympathetic stimulation promotes vasodilation. Renin-angiotensin-aldosterone
system (RAAS) regulates blood volume and pressure through angiotensin II-mediated
vasoconstriction.
Aortic aneurysm and dissection. Caused by elastin degradation, chronic hypertension, and
genetic factors. Matrix metalloproteinases (MMPs) play a role in extracellular matrix remodeling.
Atherosclerosis. Initiated by endothelial injury and lipid accumulation. Involves inflammation,
foam cell formation, and plaque rupture.
Hypertension and stiffness. Chronic hypertension accelerates arterial stiffening, increasing
cardiac workload. Pulse wave velocity (PWV) is used as a marker of arterial stiffness.
Conclusion.
The aorta is a highly specialized artery that ensures efficient blood distribution
through its elastic and regulatory mechanisms. Age-related changes and pathological conditions
such as hypertension and atherosclerosis significantly impact its function. Advances in molecular
research continue to provide new insights into aortic health, with potential therapeutic
implications for cardiovascular diseases.
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