Blood Pressure

Circulatory System

What is Blood Pressure

Is the force when you heart contracts and relaxes to push blood thought the body. There needs to needs to be a certain level of sure for perfusion to happen so oxygen and carbon dioxide and nutrients and wast to exchange at the capillary level.

How is Blood Pressure Maintained

Blood pressure is maintained by:

  • Heart Rate
  • Increasing and decreasing how hard the heart contracts
  • Blood volume
  • Distillation and constrictions of vessels in the circulatory system
  • The autonomic nervous system (ANS) regulates blood pressure.
  • It consists of two divisions: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
    • The SNS activates the “fight-or-flight” response:
    • Releases norepinephrine, causing vasoconstriction (narrowing of blood vessels).
    • Increases peripheral resistance, raising blood pressure.
    • Stimulates release of epinephrine, increasing heart rate and cardiac output.
  • The PNS activates the “rest-and-digest” response:
    • Releases acetylcholine, causing vasodilation (widening of blood vessels).
    • Reduces peripheral resistance, lowering blood pressure.
    • Slows down heart rate, decreasing cardiac output.
  • The SNS and PNS work together to maintain blood pressure balance.
  • Baroreceptors in arteries detect blood pressure changes.
  • Brain activates SNS if blood pressure is low:
  • Causes vasoconstriction and increased heart rate.
  • Brain activates PNS if blood pressure is high:
    • Causes vasodilation and decreased heart rate.
  • The autonomic nervous system adjusts vasoconstriction, vasodilation, heart rate, and cardiac output to maintain optimal blood pressure and tissue perfusion.n throughout the body.

How does the heart and circulatory system work together to maintain Blood Pressure.

The can maintain Blood Pressure by either increasing or decreasing the number of beats per minute and increase and decrease the force the heart muscle contracts. To increase the blood pressure the control centre can increase the rate and or how hard the heart contracts. To lower blood pressure the heart can slow down the rate and or decrease how hard the heart is contracting.

The vessel in the circulatory system have the ability to dilate to increase the physical space in the circulatory system to decease blood pressure while vessel can constrict to decrease the physical space to increase blood pressure. If a person has had some type of blood loss or dehydrated so the there is less blood volume then needed the circulatory system will decrease the size of the tank by constricting vessels.

Arteries: What They Are, Anatomy & Function. (n.d.). Cleveland Clinic.

Veins: Anatomy and Function. (n.d.). Cleveland Clinic.