Discussion
A clot transported by blood from a vessel and forced into a smaller one, thus obstructing circulation is ..........
Answer: D
The clot is an embolus.
An embolus is a clot, or other mass such as fat or air, that breaks loose and travels in the bloodstream until it lodges in a vessel too narrow to let it pass, blocking the circulation there (embolism). A clot from the leg veins that lodges in the lungs is a pulmonary embolism.
Osmosis and diffusion are processes by which water and solutes move across membranes, and dyspnea is difficult or laboured breathing. None of them is a travelling clot.
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