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Red blood cell arrives from the inferior vena cava into right atrium before it passes through the tricuspid valve into right ventricle. It then passes through the pulmonary valve into pulmonary artery bef...

Difficult to write a practice question.  

Mass of the isotope/atom compared to 1/12th the mass of an atom of Carbon 12 (12C)

Persists in the environment/soil/water. Enters the food chain and builds up the higher up the chain you move. Can enter human tissue eventually.  

Detect surounding stimuli. Convert that information to impulses and send to the brain.