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| Vascular system | |
|---|---|
| Name | Vascular system |
| System | Circulatory |
Vascular system The vascular system is the network of blood vessels that distributes blood throughout the body, supporting gas exchange, nutrient delivery, and waste removal. It integrates with the heart, lungs, kidneys, liver and endocrine organs to maintain homeostasis and respond to physiological stressors. Anatomical, developmental and pathological aspects have been studied by physicians and scientists in contexts such as Harvey, William Harvey, Claude Bernard, Santiago Ramón y Cajal, Camillo Golgi and institutions like Johns Hopkins Hospital, Mayo Clinic and Massachusetts General Hospital.
Major components include arteries, veins and microvasculature arranged around organs such as the brain, heart, lung, liver, kidney, spleen and intestine. The systemic circuit connects to the aorta and its branches including the brachiocephalic artery, left common carotid artery and left subclavian artery, while the pulmonary circuit involves the pulmonary trunk and pulmonary arteries. Venous return routes include the superior vena cava and inferior vena cava, with tributaries such as the jugular vein and femoral vein. Microanatomy features endothelial cells, basement membrane and perivascular cells with landmarks studied by researchers at Harvard Medical School, Stanford University School of Medicine and Imperial College London.
Arteries (elastic and muscular) such as the aorta and coronary arteries contrast with arterioles that regulate peripheral resistance; capillaries including continuous, fenestrated and sinusoidal types perfuse tissues like the renal cortex, endocrine glands and bone marrow. Veins, venules and lymphatic vessels such as those draining into the thoracic duct return fluid and immune cells to the circulation; lymphatics interact with organs like the spleen and lymph nodes studied by immunologists at the Pasteur Institute and Rockefeller University.
The vascular network facilitates oxygen transport in concert with the lungs and hemoglobin in red blood cells, modulates perfusion based on metabolic demand in organs including the brain and skeletal muscle, and mediates inflammatory responses involving the spleen and bone marrow. Endothelial-derived signals like nitric oxide were elucidated in research at Karolinska Institutet and affect vasodilation in clinical studies at Cleveland Clinic. Interactions with the adrenal gland and pituitary gland via hormones such as adrenaline and vasopressin link vascular tone to stress responses examined by groups at UCL and Columbia University.
Vasculogenesis and angiogenesis in the embryo involve factors identified in experiments at Cambridge University and Max Planck Society, including VEGF signaling and Notch pathways; the heart tube and dorsal aorta form early alongside structures like the yolk sac and placenta. Neural crest contributions to great vessel patterning connect to congenital malformations documented at pediatric centers such as Great Ormond Street Hospital.
Blood pressure regulation integrates baroreceptor input from the carotid sinus and aortic arch with renal control via the renin–angiotensin system described in studies at Imperial College and Beth Israel Deaconess Medical Center. Hemodynamic principles such as laminar versus turbulent flow, shear stress and Poiseuille’s law underpin research in biomechanics labs at MIT, ETH Zurich and Delft University of Technology. Autonomic centers in the medulla oblongata and hypothalamus modulate vascular resistance during reflexes including the Valsalva maneuver.
Atherosclerosis, aneurysm, arterial dissection, venous thromboembolism and vasculitis affect major vessels; clinical management is practiced at centers like Cleveland Clinic, Johns Hopkins Hospital and Mayo Clinic. Ischemic stroke, myocardial infarction and peripheral artery disease involve occlusion of cerebral, coronary and limb arteries respectively; outcomes and trials have been reported by organizations including the World Health Organization and American Heart Association. Genetic and inflammatory vasculopathies including Marfan syndrome and Takayasu arteritis are studied at specialist clinics such as Mount Sinai Hospital.
Noninvasive modalities include duplex ultrasonography, computed tomography angiography performed with scanners from manufacturers like Siemens Healthineers and GE Healthcare, magnetic resonance angiography developed in institutions like Stanford University and invasive digital subtraction angiography used in interventional suites at Massachusetts General Hospital. Functional tests such as ankle-brachial index and stress testing are standard in vascular labs accredited by professional bodies like the European Society of Cardiology and American College of Cardiology.
Medical therapies include antiplatelet agents, anticoagulants and lipid-lowering drugs developed through trials at NIH and pharmaceutical companies like Pfizer and AstraZeneca. Endovascular techniques—angioplasty, stenting and thrombectomy—are performed in hybrid theaters at centers including Mount Sinai Hospital and Johns Hopkins Hospital, while surgical options such as bypass grafting and endarterectomy are established procedures refined by surgeons trained at Royal College of Surgeons programs.
Category:Circulatory system