Varicose veins sometimes occur due to a poor return of blood flow through the veins. If blood is allowed.....

to pool in the extremeties the valves may fail and cause varicose veins. Which of the following activities contributes to the formation of varicaose veins?
a. a nurse wo is so busy taking care of patients during a 12 hr. shift that theres no time to sit down.
b. a factory worker who stands by a conveyor belt all day packing widgets into boxes
c. a college professor who spends many hours at a desk grading hundreds of term papers.
d. a pregnant woman whose venous pressure in the lower extremeties is increased by an expanded uterus compressing the veins there.
e. All of the above may contribute to the formation of varicose veins.

All of the above may contribute to the formation of varicose veins.

Blood flow is affected by gravity thus prolonged standing and sitting can alter the venous blood flow. Prolonged sitting as well the increased pressure on the veins of the lower part caused by enlarging uterus during pregnancy build up increasing pressure changes in the veins. Effects of gravity and increasing pressure changes weakens the walls of the veins and alters the return flow of the blood causing the varicosity.

All of the above or any condition that limits regular movements of the lower extremities that would cause the muscles to contract with regularity. It is this activity that promotes venous return.

all of the above.

a.) nurse stands for long hours therefore causing venous blood to pool in the veins.

b.) standing at the same spot causes blood pooling as part of venous return is assisted by the 'milking' action of the leg muscles through activities like walking

c.) same as (b)

d.) as explained by question

Hope this helps! :D

hurm.. b, c, and d make sense but for a. the nurse is busy taking care of patients..she must not have been just standing right? i mean, she must be walking (or even running) here and there, and that promotes venous return and prevent venous pooling. only my 5cents comment. maybe not so much a help. sorry. =p

all

e all of the above.
Varicose veins normally occur in humans and apes. Erect posture is the evolutionary etiology. Ascites,pregnancy,intra abdominal tumors, right sided heart failure also cause varicose veins.