TBR Cardio Passage

[greenseeking]

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Hello I have questions about distensibility, elasticity, compliance, and how that relates together. There were two passages from TBR Cardio section that I got wrong below-- My questions are bolded.

One of the passages from Cardio section, p. 117, said that arteries are more distensible than veins because they are thicker and stronger... So is distensibility is a measure of rigidness?

However, in another passage, pg. 125 it said that compliance in the aorta as you get older decreases and it's defined by delta V/delta P... [B ]So is compliance a measure of stretchability?[/B]
How is this so because I thought aorta doesn't like to stretch in Volume because it needs to maintain its high pressure.

And how does elasticity play into this? I know that arteries have a lot of elastic tissue, but they are defined to be the least distensible and pretty compliant.

 

[MedPR]

Hello I have questions about distensibility, elasticity, compliance, and how that relates together. There were two passages from TBR Cardio section that I got wrong below-- My questions are bolded.

One of the passages from Cardio section, p. 117, said that arteries are more distensible than veins because they are thicker and stronger... So is distensibility is a measure of rigidness?

However, in another passage, pg. 125 it said that compliance in the aorta as you get older decreases and it's defined by delta V/delta P... [B ]So is compliance a measure of stretchability?[/B]
How is this so because I thought aorta doesn't like to stretch in Volume because it needs to maintain its high pressure.

And how does elasticity play into this? I know that arteries have a lot of elastic tissue, but they are defined to be the least distensible and pretty compliant.

Distensibility refers to "stretchyness." If something is distended, it is stretched. Veins are more distensible than arteries though.. So I'm not sure if what you are saying is taken out of context.

Compliance is also a measure of "stretchyness." The more compliant, the more it will stretch and recoil. The aorta is the largest artery in the body and it is the first artery that systemic blood flows through. Therefore blood is at the highest pressure in the artery since it is coming directly out of the heart. If the aorta were not compliant, blood would likely backflow into the heart since the aorta wouldn't stretch (distend) to accommodate flow.

Arteries need to be compliant to stretch as blood pulses through them.

 

[greenseeking]

Hm thanks for your help. Maybe I am overthinking this...