oxygen
Listeria bacteria can pass through the wall of the intestines, and from there they can get into 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.
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.
The blood-brain barrier, via the blood stream.
through the kidneys
Through the blood stream
Oxygen is brought into the blood stream by inhalation. Carbon dioxide moves out of the cells, into the blood, and taken to the lungs to be exhaled. Oxygen in, carbon dioxide out.
The blood in the circulatory system carries nutrients inward to cells. Red Blood Cells carry oxygen attached to the hemoglobin. The blood also returns waste to the kidneys, before returning to the lungs and heart.
Cocaine.
Haemoglobin in your red blood cells carries the oxygen through your blood stream to different parts of your body. The carbon bi oxide comes dissolved in red blood cells as well as in plasma.
liver