Cardiovascular dynamics

Question 1

Magnitude (how much blood) =
Distribution (where blood goes)=

Answer 1

magnitude=heart
distribution=systemic circulation

Question 2

What are the three factors that influence the magnitude of blood flow through heart performance?

Answer 2

1.Preload
2.Afterload
3.Contractility

Question 3

Preload
What is it and what is it influenced by?

Answer 3

(represented by EDV)
1.The ability to return blood to heart via venous return
2.influenced by muscle pump, respitory pump, abdomial muscles, degree of venoconstriction, AND body position!!

Question 4

What is the Frank-Streling law for preload?

Answer 4

the heart will pump the blood it recieves (like the air in a balloon)

Question 5

What is the best body position to enchance preload?

Answer 5

Laying down vertically

Question 6

As you increase preload, you ______ blood pumped out of heart

Answer 6

As you increase preload, you INCREASE blood pumped out of heart

Question 7

Afterload
what is it and what is it influened by?

Answer 7

(represented by TPR and MAP)
1.the pressure heart has to overcome to eject blood into systemic circulation
2.influenced by degree of vasocontriction and vessel health

Question 8

Contractillity
what is it realted to?

Answer 8

1.The strength of ventricular contraction
2.Strength of ventricular contaction is related to concentration of Ca2+, preload, and nervous innervation

Question 9

What are the two main factors of distribution?

Answer 9

Neural Mechanisms and Metabolic conditons

Question 10

Neural Mechanisms

Answer 10

-the “central command center” (hypothalamus and medulla oblongata) send blood where its anticipated

-barroreceptors in vessels montior BP and relay to medulla oblongata (feedback system)

Question 11

Metabolic conditions

Answer 11

-Increase H+, CO2, lactate, and adenosine build up promotes increased blood flow!!

Enothelial-derived relaxing factors (EDRFs): like Nitric Oxide (NO) are released from vesslel walls to promote vasodialation and increase blood flow