Blood is transported throughout the body through both arteries and veins, but a significant difference between the two is the presence of valves in veins. some people develop chronic venous disease (cvd), which initially causes higher venous blood pressure and vein dilation, resulting in weakened vein valves. what do you predict would happen as the valve damage progresses?

a) blood would leak backwards through the damaged valves due to gravity, causing lower leg swelling.

b) veins would thicken and constrict, causing a restriction in blood flow, and leading to arterial leakage.

c) veins would carry a both oxygenated and deoxygenated blood away from the legs, causing oxygen deficiency.

d) blood flow would increase through the veins since the blood would not be impeded by valves.

A. Blood would leak backwards through the damaged valves due to gravity, causing lower leg swelling.

Explanation:

The passage of blood is always in a single direction in the vein due to the presence of valves in the veins.

Any kind of vein injury or vein rupture, causes the valves in the veins to not function in an appropriate manner. The injury might result in inappropriate opening and closing of these valves. The inappropriate functioning of the valves causes the blood to flow backwards. This will eventually lead to blood pooling and putting more pressure on the lower leg veins. hence, there would be swelling in the lower legs.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: