Untitled Deck Flashcards
What are thoroughfare channels?
Channels that take blood from terminal arteriole to postcapillary venule and bypass the capillary
What are metabolites that cause local vasodilation?
Adenosine, phosphate, lactate, pCO2, H-, K+
What are some factors that impact preload?
Venous return, skeletal muscle pump, respiratory pump, venoconstriction
Describe catecholamines throughout exercise.
They begin rising early and continue rising
Describe cortisol throughout exercise.
It peaks at the beginning but goes back down quickly
Describe glucagon throughout exercise.
It rises for about 90 minutes but then plateaus
What happens to SV with exercise?
It increases; preload is increased from greater venous return and sympathetic activation boosts contractility
What happens to HR with exercise?
It increases; this initially is due to PSNS withdrawal but then is due to sympathetic activation
Which has a greater impact on CO during exercise: SV or HR?
HR
How does flow to the brain change during exercise?
It doesn’t! This results in the overall percentage traveling to the brain to decrease
Flow to ___, ____, and ____ increases during exercise.
Skin, skeletal muscle, and brain
How does blood pressure/MAP change with exercise?
Systolic increases, and diastolic changes are ambiguous. The systolic increase raises MAP.
What does it indicate if SBP does not increase with exercise?
Mortality
What happens to SVR during exercise?
It drops
How does a-vO2 change during exercise?
It widens as venous O2 content falls. This means more oxygen is being extracted from the blood
