What are the three main sources of peripheral resistance?

What are the three main sources of peripheral resistance?

What are the three main sources of peripheral resistance?

Since most of the resistance is located in the peripheral circulation, we often call this peripheral resistance. There are three important sources of resistance: vessel length, blood viscosity, and vessel diameter. Let’s discuss blood vessel length first.

Which factor has the biggest impact on peripheral resistance?

Radius of the arterioles is the most important factor, affecting vascular resistance, and it is regulated by systemic and local factors: Systemic factors include: Arterial baroreflex control (increased BP leads to a decrease in SVR. Peripheral and central chemoreceptors (hypoxia leads to increased SVR)

What causes increased vascular resistance?

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.

What event is primarily responsible for peripheral resistance?

The central dictation of peripheral vascular resistance occurs at the level of the arterioles. The arterioles dilate and constrict in response to different neuronal and hormonal signals.

What does vascular resistance depend on?

Vascular resistance depends on blood flow which is divided into 2 adjacent parts : a plug flow, highly concentrated in RBCs, and a sheath flow, more fluid plasma release-cell layering. Both coexist and have different viscosities, sizes and velocity profiles in the vascular system.

How do you reduce vascular resistance?

Medications to lower peripheral vascular resistance include beta-blockers, diuretics, ACE-inhibitors, calcium-channel blockers, and alpha-blockers.

What factors affect BP?

High blood pressure has many risk factors, including:

  • Age. The risk of high blood pressure increases as you age.
  • Race.
  • Family history.
  • Being overweight or obese.
  • Not being physically active.
  • Using tobacco.
  • Too much salt (sodium) in your diet.
  • Too little potassium in your diet.