Supply and demand. The coronary arteries regulate the supply of blood to your heart muscle depending on how much oxygen your heart needs at the time, as indicated by: The number of times your heart beats per minute (heart rate). Your blood pressure. The force of your heart's contractions.
The pinworm is the most common roundworm in the United States. It is small and threadlike and infests many more children than adults. The ascaris roundworm thrives in the intestinal tract of mammals and can range in length from six to thirteen inches.
Common helminthes include: roundworms or ascariasis, tapeworms, pinworms, hookworms and strongyloidiasis. Roundworms or ascariasis are the most common type of intestinal parasite in the world. This worm not only affects humans, but it can also affect animals like pigs. It is not communicable; it can only be acquired through eating of the worm's eggs (present in infected foods).