Three main sources of peripheral resistance: blood vessel diameter, blood viscosity and total vessel length. When arteries lose their elasticity and become stiffer, blood pressure rises.
What 4 factors contribute to blood resistance?
There are three important sources of resistance: vessel length, blood viscosity, and vessel diameter. First, let’s discuss the length of the blood vessels. The resistance related to the total length of blood vessels is simple: the longer the blood vessel, the greater the resistance.
What factors influence cardiac output and peripheral resistance?
Cardiac Output These factors include sympathetic stimulation, epinephrine and norepinephrine catecholamines, thyroid hormones, and elevated calcium ion levels. Conversely, any factor that decreases cardiac output by decreasing heart rate or stroke volume, or both, decreases blood pressure and blood flow.
What factors can affect the Peripheral Resistance Quizlet?
What are the 3 main sources of peripheral resistance? blood vessel diameter, blood viscosity and total vessel length.
What factors influence blood resistance?
There are three main factors that determine the resistance to blood flow in an individual vessel: the diameter (or radius) of the vessel, the length of the vessel, and the viscosity of the blood. Of these three factors, vessel diameter is quantitatively and physiologically the most important.
What are the four main factors that affect blood pressure?
What are the 4 main factors that affect blood pressure? Peripheral resistance, vascular elasticity, blood volume and cardiac output. Blood cells and plasma encounter resistance when they come into contact with the walls of blood vessels.
What are the two main factors that affect blood pressure?
Blood pressure increases with increasing cardiac output, peripheral vascular resistance, blood volume, blood viscosity and vascular wall stiffness. Blood pressure decreases with decreasing cardiac output, peripheral vascular resistance, blood volume, blood viscosity and elasticity of the vascular walls.
What factors can affect peripheral resistance?
back | nextPeripheral Resistance Peripheral resistance is determined by three factors: Autonomic activity: Sympathetic activity narrows the peripheral arteries. Pharmacological agents: vasoconstrictor drugs increase resistance while vasodilators decrease it. Blood Viscosity: Increased viscosity increases resistance.
How does peripheral resistance affect cardiac output?
Cardiac output is a function of heart rate and stroke volume. If the pressure in a vessel increases, the blood flow increases. However, when resistance in a vessel increases, blood flow decreases. 20
What factors affect cardiac output?
The factors affect cardiac output by changing heart rate and stroke volume. The main factors include blood volume reflexes, autonomic innervation and hormones. Secondary factors include extracellular fluid ion concentration, body temperature, emotions, gender, and age.
What causes an increase in total peripheral resistance?
Peripheral vascular resistance (systemic vascular resistance, SVR) is the resistance in the circulatory system used to generate blood pressure and blood flow, and is also a component of cardiac function. When blood vessels narrow (vasoconstriction), this causes the SVR to increase. fifteen