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Physiology

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Cardiovascular System

Question
2 out of 16
 

In standing position venous return affected by a/e?(AIPG 2010)


A Arterial pressure

B Deep fascia

C Calf muscles

D Competent valves of perforator

Ans. A Arterial pressure

Venous return: Venous return is equal to CO, it depends on

a. Respiratory pump (negative intrathoracic pressure)

d. Sympathetic tone

b. Peripheral Muscle pump

c. Cardiac pump

e. Venous Compliance

f. Gravity (like posture)

g. Deep fascia

h. Venous valves

i. Vena cava compression (pregnancy)

Venous pressure gradient that is VR = (Psf – PRA)/ RVRin which VR is venous return, Psf is mean systemic filling pressure, PRA is right atrial pressure, and RVR is resistance to venous return. Hemodynamically, venous return (VR) to the heart from the venous vascular beds is determined by a venous pressure gradient. Therefore, increases in venous pressure or decreases in right atrial pressure or venous resistance will lead to an increase in venous return.

Cardiovascular System Flashcard List

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