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Concept 18. Perfusion Questions and Answers Graded A+
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Concept 18. Perfusion
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Concept 18. PerfusionDescribe what is Perfusion - answer Flow of blood through arteries and capillaries
delivering nutrients and oxygen to cells
*Process that requires the heart to generate sufficient cardiac output to transport blood
through patent blood vessels fir distribution in the tissues throughout the body
Describe the scope of perfusion which it ranges from - answer Optimal Perfusion ------
Impaired Perfusion--------> No Perfusion (tissue death)
Describe Central Perfusion - answer Propels blood to all organs and their tissues from
patent arteries through capillaries and returns the blood to the heart through patient
veins
• Cardiac Output
* The amount of blood pumped by the heart each minute
* The cardiac cycle very important and normal ranges from 4 to 6 L/min in adult
* Stroke volume= amount of blood ejected with each contraction
*Heart rate contributes to CO and also systemic vascular resistance (amount of
resistance the heart pumps against)
Describe Tissue Perfusion - answerThe volume of blood that flows through target
tissues
• Supplied by blood flowing from arteries to capillaries
***Capillary hydrostatic pressure= pushes blood through capillaries into the interstitial
spaces allowing delivery of oxygen, fluid, and nutrients to cells
Explain Impaired Central Perfusion and give examples - answerResults in decreased
cardiac output and the entire body is affected
• Various factors can reduce cardiac output:
- Problems with the heart valves
- Disease to the heart muscle tissue
- Congenital defects
-Increased SVR
Explain Impaired Local/Tissue Perfusion and give examples - answerDifferent organs
and tissues require different volumes of blood to maintain adequate function
• Result from:
- Poor central perfusion
-Mechanism within the organ itself
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