Factors affecting blood pressure

[tigerthao]

Hello fellow nurses

I am currently a second year college student with an expressed interest in nursing. Can anyone explain to me the factors increasing blood flow? If you increase the blood flow would that also increase the blood pressure? Thank you!!

The factors affecting the blood flow:

Vicosity of the Blood

Compliance (elasticity of arteries)

Blood Volume

Cardiac Output

Blood vessels length and diameter

[roser13, ASN, RN]

Have you read your textbook on Fundamentals of Nursing?

Use your resources wisely, for less-than-basic issues that confound you.

[offlabel]

Entire textbooks are written on neuro-humeral mechanisms of blood pressure alone. You might as well ask for a quick rundown on the rise and fall of the Roman Empire.

[tigerthao]

I have read the book but I do not understand why an increase in compliance would cause a decrease in the blood pressure. If there is an increase in compliance wouldn't that mean that the arteries are vasodilating thus an increase in stroke volume and an increase in blood pressure?

[tigerthao]

Sorry if I wasn't being specific. Why would an increase in compliance cause a decrease in blood pressure? Shouldn't it increase the blood pressure instead because an increase in compliance would mean that the arteries are vasodilating?

[tigerthao]

We do not use that textbook... this is for my anatomy class. I'm still doing prerequisites.

[Rose_Queen, BSN, MSN, RN]

I have read the book but I do not understand why an increase in compliance would cause a decrease in the blood pressure. If there is an increase in compliance wouldn't that mean that the arteries are vasodilating thus an increase in stroke volume and an increase in blood pressure?

What happens when arteries are dilated? Do they get larger or smaller? What happens with the volume of circulating blood? Does it get larger, smaller, or stay the same? Now tell us what you think and what the blood pressure would do in relation to those answers to the questions I asked.

[tigerthao]

When the arteries are dilated they get larger because blood is filling increasing the preload which increases the stroke volume. If it increases stroke volume, heart rate increases, Cardiac output increases and so does the blood pressure. The volume of the blood is the smaller because pressure is increasing. The volume pumped by two sides of the heart is the same. I don't know if I'm thinking my way through this correctly but that is what I think... correct me if I'm wrong I want to learn. Thank you!

[tigerthao]

Wait increasing blood pressure and volume would decrease heart rate because of the barareceptors.

[Rose_Queen, BSN, MSN, RN]

Ok, let's try an experiment. Get a quart sized baggie and fill it with water. Zip it closed and feel the pressure on the bag. Then pour that water into a gallon sized ziplock baggie. Which baggie is under more pressure?

[tigerthao]

Nvm I just figured it out. Increasing the elasticity of the arteries decreases the blood pressure because the arteries stretches, increasing the circumference of the vessels giving them more room for the blood to fill. Thank you!

[Julius Seizure]

This thread made me so happy. Keep studying, good luck to you!