Module 9 ML- 4 Part 1 Flashcards
True or False; arterioles match blood flow with local tissue/cellular metabolic demand
True
What does the thick smooth layer around arterioles do
regulates pressure and flow downstream into the capillaries
Arteriole with increased radium, decreased resistance and increased flow
increased flow, volume and pressure to capillary beds
Arteriole with decreased radius, increased resistance and decreased flow
low flow volume and pressure in capillary beds
Local environment
cels being perfused and capillaries doing the perfusion
Local factors
things that influence arteriole
As blood goes through capillaries to veins what does it gain/lose?
loses O2, gains waste and acids and CO2
What are the two main functions of arterioles
- match blood flow to local tissue/cellular metabolic demand
-collectively to maintain map by determining TPR they need to protect MABP by TPR coorperayion
What are some conflicts for arterioles
conflict of skeletal muscle arterioles when you excercise on a hot day and which organs win or lose when supply cannot keep up with demand
What contributes resistance to blood flow
all blood vessels
What is the main contributor to total TPR
arterioles
True or False: smooth muscle contraction allows arterioles to alter TPR
true
What are the conditioning organs
kidneys, intestines, and skin
Characteristics of conditioning organs
-recieve blood flow in excess of their personal metabolic needs
-very tolerant of blood flow reduction
- they are constricted to protect blood pressur
What are the flow dependent organs
brain and heart
Characteristic of flow dependent organs
critically dependent on blood flow for survival
-no tolerance for low blood flow
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How do skeletal muscle arterioles get more blood
they activley vasodilate
What happens to arterioles to organs that are not needed while excercising
they vasoconstrict and get less blood
While excericisng what happens to skin arterioles
they vasodilate to cool the core
What happens to MABP during excercise
slight rise due to increase in CO
What happens to TPR during excercise
big decrease due to less resistance caused by increased dilation of arterioles
What gets increased flow during excercise
skin, skeltal muscle, heart and brain
What gets less flow during excercise
abdominal organs, kidney and others
