Movement Of Blood And Fluid Flashcards
The circulatory system is made up of two circuits. What are these?
Pulmonary
Systemic (rest of body)
What is bulk flow?
The movement of fluid due to differences in hydrostatic pressure
What is hydrostatic pressure?
The force exerted on a container by a fluid
How does the body alter hydrostatic pressure?
Vasoconstriction/dilation
What is perfusion pressure?
The pressure needed for blood to move through a blood vessel
Transmural (across an organ) hydrostatic pressure causes bulk flow across capillary walls in exchange for what?
Interstitial fluid (fluid surrounding tissues)
What is oncotic pressure?
Pressure exerted by proteins that pulls water into the blood
What protein is responsible for exerting oncotic pressure?
Albumin
What is Starling’s Law of capillaries?
Hydrostatic and oncotic pressure differences across the vessel wall balance to determine the movement of fluid
If Starling’s Law of capillaries is positive, what does that mean?
Water is filtered out of capillary
If Starling’s Law of capillaries is negative, what happens?
Water is drawn into capillaries
What removes excess interstitial fluid,and where does it go to?
Removed by lympathic system
Returned to blood stream
If the lymphatic system fails to remove excess interstitial fluid, what happens?
Oedema (XS fluid in body cavity/tissue)
Blood goes through one capillary bed and back to the heart, except for…?
In the gut, goes through the hepatic portal vein to the liver
What is cardiac output?
Stroke volume X Heart rate
