Search results
Results from the WOW.Com Content Network
Vasodilation plays a major role in immune system function. Wider blood vessels allow more blood containing immune cells and proteins to reach the infection site. Vasodilation occurs as part of the process of inflammation, which is caused by several factors including presence of a pathogen, injury to tissues or blood vessels, and immune ...
Vascular resistance is the resistance that must be overcome for blood to flow through the circulatory system.The resistance offered by the systemic circulation is known as the systemic vascular resistance or may sometimes be called by another term total peripheral resistance, while the resistance caused by the pulmonary circulation is known as the pulmonary vascular resistance.
Early symptoms of hypovolemia include headache, fatigue, weakness, thirst, and dizziness. The more severe signs and symptoms are often associated with hypovolemic shock. These include oliguria , cyanosis , abdominal and chest pain, hypotension , tachycardia , cold hands and feet, and progressively altering mental status.
Signs and symptoms of hypovolemic shock include: A rapid, weak, thready pulse due to decreased blood flow combined with tachycardia; Cool skin due to vasoconstriction and stimulation of vasoconstriction; Rapid and shallow breathing due to sympathetic nervous system stimulation and acidosis; Hypothermia due to decreased perfusion and evaporation ...
Vasodilation and vasoconstriction are complex phenomena; they are functions not merely of the fluid mechanics of pressure and tissue elasticity but also of active homeostatic regulation with hormones and cell signaling, in which the body produces endogenous vasodilators and vasoconstrictors to modify its vessels' compliance.
For premium support please call: 800-290-4726 more ways to reach us
Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, in particular the large arteries and small arterioles. The process is the opposite of vasodilation , the widening of blood vessels.
It is regulated by vasoconstrictors (agents that cause vasoconstriction). These can include paracrine factors (e.g., prostaglandins), a number of hormones (e.g., vasopressin and angiotensin [26]) and neurotransmitters (e.g., epinephrine) from the nervous system. Vasodilation is a similar