Blood Flow And Blood Pressure Flashcards
Arteries are known as what of the circulatory system
Pressure reservoir
What vessel is known as the site of variable resistance and why
The arterioles. They create a high resistance outlet for arterial blood flow and distribute blood to individual tissues by selectively constricting and dilating.
What regulates arteriolar diameter
Local factors such as tissue oxygen concentrations and by the autonomic nervous system and hormones
What does the leaky epithelium of a capillary allow
It allows exchange of materials between the plasma, interstitial fluid and the cells of the body
What type of control regulates diameter of blood vessel
Global control and local control
What is global control
Sympathetic (CNS) reflexes and hormonal control
Where is local control
Paracrines released by endothelial cells and myogenic autoregulation
What is the difference in pressures in the filtration and absorbstion capillary exchange
Positive net pressure indicates filtration. Negative net pressure indicates absorption.
