ANATOMY

Detailed explanation-1: -Peripheral vascular resistance (systemic vascular resistance, SVR) is the resistance in the circulatory system that is used to create blood pressure, the flow of blood and is also a component of cardiac function. When blood vessels constrict (vasoconstriction) this leads to an increase in SVR.

Detailed explanation-2: -The constriction of arterioles increases resistance, which causes a decrease in blood flow to downstream capillaries and a larger decrease in blood pressure. Dilation of arterioles causes a decrease in resistance, increasing blood flow to downstream capillaries and a smaller decrease in blood pressure.

Detailed explanation-3: -Vasoconstriction is the narrowing of blood vessels, typically when the muscles of blood vessel walls become constricted, causing the vessel lumen to become smaller. Vasoconstriction can be a reaction to cold, stress, cigarette smoking, medications, or underlying medical conditions, such as the Raynaud phenomenon.

Detailed explanation-4: -In the arterial system, as resistance increases, blood pressure increases and flow decreases.

Detailed explanation-5: -How does vasoconstriction increase blood pressure? When blood vessels become narrow, it takes more pressure for the blood to travel through the blood vessels.