The lymph nodes are all over the body and each area or region is drained by its group of lymph nodes. They do not pass through one node but they drain in the thoracic duct which ultimately opens and drains in the large veins of the neck on the left side
through the kidneys
CSF is returned to the blood stream through lateral ventricles
Spleen
Your blood must pass through your lungs, before it goes to the rest of the body.
Listeria bacteria can pass through the wall of the intestines, and from there they can get into the blood stream.
embolus.
Through the blood stream.
In air breathing animals, oxygen enters the blood stream through the alveoli, tiny sacs in the lungs. In water breathing animals oxygen enters the blood stream through the gills.
their color
Oxygen enters the blood stream through the air sacs in you lungs.
Either through the umbilical cord (in the case of a pregnant woman) or by passive smoking.Nicotine gets into the mothers blood stream which then flows into the baby's blood stream.
This occurs in the small intestine by deffusion into the blood stream.