(vā″zō-kŏn-strik′shŏn) To hear audio pronunciation of this topic, purchase a subscription or log in. [vaso-+constriction] A decrease in the diameter of blood vessels, which decreases blood flow and raises blood pressure. There's more to see -- the rest of this topic is available...
Figure 5.12.10.Operating point of the cardiovascular system during strenuous exercise. The cardiac function curve is greatly enhanced by increased heart rate and increased contractility. The vascular function curve is affected by venoconstriction, which raises mean systemic pressure; by vasodilation, which...
your brain even turns off your body thermometer. That's when heat or cold in your bedroom affects you more. In general, a cooler room helps you sleep better. A few pushups or a jog when you wake raises your temperature and makes you more alert...
In animal studies of CHF, it was found that the limited capacity to enhance ventricular performance is responsible for a functional shift from a cardiac output to a systemic vascular resistance (SVR) increase in the mechanism by which the cardiovascular system raises blood pressure in response to ...
Tyramine infusion to humans increased systolic blood pressure but increased forearm blood flow which also indicated a paradoxical vasodilatation (Jacob et al., 2003). This raises the question whether vessels that display a predominant vasoconstriction, such as the aorta, also exhibit an underlying ...
In a region of a lung with alveolar hypoxia, vascular smooth muscle contracts and raises local vascular resistance, which may reduce blood flow. The precise mechanism of such hypoxic pulmonary vasoconstriction is still not known, but, because it can be observed in excised isolated lungs, it clea...
pressure, increasing coronary artery flow) and, in combination with the lowered heart rate, causes a fall in cardiac output. Mesenteric and renal arteries may be constricted, but renal blood flow may increase owing to the increased arterial pressure. Noradrenaline raises pulmonary vascular resistance....