Environmental contaminants are chemicals that are present in the environment in which the food is grown, harvested, transported, stored, packaged, processed, and consumed. The physical contact of the food with its environment results in its contamination.Possible sources of contamination include:lso, food contaminant testing assures consumers safety and quality of purchased food products and can prevent foodborne diseases, and chemical, microbiological, or physical food hazards.
The most common cause of portal hypertension is cirrhosis of the liver. Cirrhosis is scarring which accompanies the healing of liver injury caused by hepatitis, alcohol, or other less common causes of liver damage. In cirrhosis, the scar tissue blocks the flow of blood through the liver.
The walls of the blood vessels restrict where blood can flow, thereby creating friction as the blood flows against the walls. Two factors of blood vessels walls effect blood flow resistance: = Blood vessel length: The longer a blood vessel, the more resistance the blood will encounter as it flows. Blood vessel length is fixed, and therefore resistance due to blood vessel length is constant, in the adult.