The CP epithelial layer is continuous with the ependymal cell layer that lines the ventricles
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Yes. A decaying tooth can spread bacteria into the bloodstream, and the lining (the endocardium) and valves of the heart are sites where these bacteria tend to form colonies (so-called vegetations), leading to a condition called infective endocarditis, resulting in the destruction of the valve, or even stroke (parts of vegetation can form emboli (plugs) in the brain).
Atrioventricular valves ar the valves in the heart that lie between the atria and the ventricles. These valves stop the the blood from flowing back (in the wtong direction) from the ventricles into the atria. There are two atrioventricular valves, on the right is the Tricuspis and on the left is the Bicuspid or Mitral valve.
the basilar artery.
well i can very well name you the hardest to do which is the brain surgery, but the most dangerous I've read is the open heart surgery and brain surgery :D and honestly, most surgery's are very dangerous haha ^-^
They both use convex lenses and they dsend signals to each other just like the brain.